engine.scope( ({ start, cls, btn, btnp, circfill, rectfill, rect, text, caption, camera, creset, rnd, }) => { const WORLD = 384; const CANVAS = 128; const LERP = 0.08; const ENEMY_CAP = 100; const PROJ_CAP = 150; const GEM_CAP = 100; const PROJ_SPEED = 3; const MAX_HP = 5; const IFRAMES = 60; const KNOCKBACK = 8; const SHAKE_DECAY = 0.85; const SHAKE_STRENGTH = 4; const CONTACT_RANGE = 36; const MAGNET_RANGE = 20; const COLLECT_RANGE = 6; const XP_PER_LEVEL = 5; const stats = { speed: 1.5, fireRate: 20, damage: 1, bulletCount: 1, magnetRange: MAGNET_RANGE, }; const UPGRADES = [ { name: 'fire rate', apply: () => { stats.fireRate = Math.max(5, stats.fireRate - 3); } }, { name: 'damage', apply: () => { stats.damage++; } }, { name: 'multi-shot', apply: () => { stats.bulletCount++; } }, { name: 'move speed', apply: () => { stats.speed += 0.3; } }, { name: 'magnet range', apply: () => { stats.magnetRange += 10; } }, ]; let px = WORLD / 2; let py = WORLD / 2; let camX = px - CANVAS / 2; let camY = py - CANVAS / 2; let kills = 0; let hp = MAX_HP; let iFrames = 0; let shakeAmount = 0; let state = 'playing'; let xp = 0; let level = 1; let xpNeeded = XP_PER_LEVEL; let menuChoices = []; let menuCursor = 0; const landmarks = []; const enemies = []; for (let i = 0; i < ENEMY_CAP; i++) { enemies.push({ x: 0, y: 0, speed: 0, color: 8, hp: 1, active: false }); } function acquireEnemy() { for (const e of enemies) { if (!e.active) { e.active = true; return e; } } return null; } const projectiles = []; for (let i = 0; i < PROJ_CAP; i++) { projectiles.push({ x: 0, y: 0, dx: 0, dy: 0, active: false }); } function acquireProjectile() { for (const p of projectiles) { if (!p.active) { p.active = true; return p; } } return null; } const gems = []; for (let i = 0; i < GEM_CAP; i++) { gems.push({ x: 0, y: 0, active: false }); } function acquireGem() { for (const g of gems) { if (!g.active) { g.active = true; return g; } } return null; } let wave = 0; let spawnBudget = 0; let spawnTimer = 0; let betweenWaves = true; let betweenTimer = 0; const WAVE_PAUSE = 120; const SPAWN_INTERVAL = 15; const WAVE_COLORS = [8, 2, 9, 14, 15, 4]; let fireTimer = 0; function startWave() { wave++; spawnBudget = 4 + wave * 2; spawnTimer = 0; betweenWaves = false; } function spawnEnemy() { const e = acquireEnemy(); if (!e) return; const side = Math.floor(rnd(4)); if (side === 0) { e.x = camX - 8; e.y = rnd(WORLD); } else if (side === 1) { e.x = camX + CANVAS + 8; e.y = rnd(WORLD); } else if (side === 2) { e.x = rnd(WORLD); e.y = camY - 8; } else { e.x = rnd(WORLD); e.y = camY + CANVAS + 8; } e.speed = 0.4 + wave * 0.05; e.color = WAVE_COLORS[(wave - 1) % WAVE_COLORS.length]; e.hp = 1 + Math.floor(wave / 3); } function findNearest() { let best = null; let bestDist = Infinity; for (const e of enemies) { if (!e.active) continue; const dx = e.x - px; const dy = e.y - py; const d = dx * dx + dy * dy; if (d < bestDist) { bestDist = d; best = e; } } return best; } function fireAt(t) { const dx = t.x - px; const dy = t.y - py; const baseAngle = Math.atan2(dy, dx); const spread = 15 * (Math.PI / 180); const count = stats.bulletCount; const startAngle = baseAngle - spread * (count - 1) / 2; for (let i = 0; i < count; i++) { const p = acquireProjectile(); if (!p) return; p.x = px; p.y = py; const angle = startAngle + spread * i; p.dx = Math.cos(angle) * PROJ_SPEED; p.dy = Math.sin(angle) * PROJ_SPEED; } } function killEnemy(e) { e.active = false; kills++; const g = acquireGem(); if (g) { g.x = e.x + rnd(6) - 3; g.y = e.y + rnd(6) - 3; } } function levelUp() { level++; xp = 0; xpNeeded = XP_PER_LEVEL + level * 2; state = 'levelup'; menuCursor = 0; const shuffled = [...UPGRADES].sort(() => rnd(1) - 0.5); menuChoices = shuffled.slice(0, 3); } function init() { for (let i = 0; i < 12; i++) { landmarks.push({ x: Math.floor(rnd(WORLD - 40) + 12), y: Math.floor(rnd(WORLD - 40) + 12), w: Math.floor(rnd(16) + 8), h: Math.floor(rnd(16) + 8), }); } } function update() { if (state === 'dead') return; if (state === 'levelup') { if (btnp('ArrowUp') || btnp('w')) { menuCursor = (menuCursor - 1 + menuChoices.length) % menuChoices.length; } if (btnp('ArrowDown') || btnp('s')) { menuCursor = (menuCursor + 1) % menuChoices.length; } if (btnp('z') || btnp(' ')) { menuChoices[menuCursor].apply(); state = 'playing'; } return; } if (btn('ArrowLeft') || btn('a')) px -= stats.speed; if (btn('ArrowRight') || btn('d')) px += stats.speed; if (btn('ArrowUp') || btn('w')) py -= stats.speed; if (btn('ArrowDown') || btn('s')) py += stats.speed; px = Math.max(3, Math.min(WORLD - 3, px)); py = Math.max(3, Math.min(WORLD - 3, py)); const targetX = px - CANVAS / 2; const targetY = py - CANVAS / 2; camX += (targetX - camX) * LERP; camY += (targetY - camY) * LERP; camX = Math.max(0, Math.min(WORLD - CANVAS, camX)); camY = Math.max(0, Math.min(WORLD - CANVAS, camY)); if (shakeAmount > 0.5) shakeAmount *= SHAKE_DECAY; else shakeAmount = 0; if (iFrames > 0) iFrames--; if (betweenWaves) { betweenTimer++; if (betweenTimer >= WAVE_PAUSE) { betweenTimer = 0; startWave(); } } else { spawnTimer++; if (spawnTimer >= SPAWN_INTERVAL && spawnBudget > 0) { spawnTimer = 0; spawnEnemy(); spawnBudget--; } if (spawnBudget <= 0) { let anyActive = false; for (const e of enemies) { if (e.active) { anyActive = true; break; } } if (!anyActive) { betweenWaves = true; betweenTimer = 0; } } } for (const e of enemies) { if (!e.active) continue; const dx = px - e.x; const dy = py - e.y; const dist = Math.sqrt(dx * dx + dy * dy); if (dist > 0) { e.x += (dx / dist) * e.speed; e.y += (dy / dist) * e.speed; } } if (iFrames <= 0) { for (const e of enemies) { if (!e.active) continue; const dx = px - e.x; const dy = py - e.y; if (dx * dx + dy * dy < CONTACT_RANGE) { hp--; iFrames = IFRAMES; shakeAmount = SHAKE_STRENGTH; const dist = Math.sqrt(dx * dx + dy * dy); if (dist > 0) { px += (dx / dist) * KNOCKBACK; py += (dy / dist) * KNOCKBACK; px = Math.max(3, Math.min(WORLD - 3, px)); py = Math.max(3, Math.min(WORLD - 3, py)); } if (hp <= 0) state = 'dead'; break; } } } fireTimer++; if (fireTimer >= stats.fireRate) { const nearest = findNearest(); if (nearest) { fireAt(nearest); fireTimer = 0; } } for (const p of projectiles) { if (!p.active) continue; p.x += p.dx; p.y += p.dy; if (p.x < 0 || p.x > WORLD || p.y < 0 || p.y > WORLD) p.active = false; } for (const p of projectiles) { if (!p.active) continue; for (const e of enemies) { if (!e.active) continue; const dx = p.x - e.x; const dy = p.y - e.y; if (dx * dx + dy * dy < 16) { p.active = false; e.hp -= stats.damage; if (e.hp <= 0) killEnemy(e); break; } } } for (const g of gems) { if (!g.active) continue; const dx = px - g.x; const dy = py - g.y; const distSq = dx * dx + dy * dy; if (distSq < COLLECT_RANGE * COLLECT_RANGE) { g.active = false; xp++; if (xp >= xpNeeded) levelUp(); } else if (distSq < stats.magnetRange * stats.magnetRange) { const dist = Math.sqrt(distSq); g.x += (dx / dist) * 1.5; g.y += (dy / dist) * 1.5; } } } function draw(time, frame) { cls(0); let sx = 0, sy = 0; if (shakeAmount > 0.5) { sx = (rnd(2) - 1) * shakeAmount; sy = (rnd(2) - 1) * shakeAmount; } camera(camX + sx, camY + sy); rect(0, 0, WORLD - 1, WORLD - 1, 6); for (const lm of landmarks) { rectfill(lm.x, lm.y, lm.x + lm.w, lm.y + lm.h, 1); } for (const g of gems) { if (!g.active) continue; circfill(g.x, g.y, 2, 11); } for (const e of enemies) { if (!e.active) continue; circfill(e.x, e.y, 3, e.color); } for (const p of projectiles) { if (!p.active) continue; circfill(p.x, p.y, 1, 10); } if (iFrames <= 0 || frame % 4 < 2) { circfill(px, py, 3, 7); } creset(); caption('wave ' + wave + ' lv ' + level, 1, 1, 7); rectfill(1, CANVAS - 7, 41, CANVAS - 3, 5); const hpFill = Math.floor((hp / MAX_HP) * 40); const hpRatio = hp / MAX_HP; const hpColor = hpRatio > 0.6 ? 11 : hpRatio > 0.3 ? 10 : 8; if (hpFill > 0) rectfill(1, CANVAS - 7, 1 + hpFill, CANVAS - 3, hpColor); caption('hp', 44, CANVAS - 8, 7); rectfill(1, CANVAS - 13, 41, CANVAS - 9, 5); const xpFill = Math.floor((xp / xpNeeded) * 40); if (xpFill > 0) rectfill(1, CANVAS - 13, 1 + xpFill, CANVAS - 9, 11); caption('xp', 44, CANVAS - 14, 7); if (state === 'levelup') { const rows = menuChoices.length; const boxH = 16 + rows * 10; const boxTop = Math.floor((CANVAS - boxH) / 2); rectfill(14, boxTop, 114, boxTop + boxH, 1); rect(14, boxTop, 114, boxTop + boxH, 6); text('level up! pick one:', 18, boxTop + 3, 7); for (let i = 0; i < rows; i++) { const y = boxTop + 13 + i * 10; const color = i === menuCursor ? 10 : 6; text((i === menuCursor ? '> ' : ' ') + menuChoices[i].name, 18, y, color); } } if (state === 'dead') { const boxH = 24; const boxTop = Math.floor((CANVAS - boxH) / 2); rectfill(20, boxTop, 108, boxTop + boxH, 0); text('you died', 42, boxTop + 4, 8); text('wave ' + wave + ' lv ' + level, 34, boxTop + 14, 7); } } start({ sprites: {}, sounds: {}, init, update, draw, target }); }, );

Editing: Bullet Heaven: Upgrade Choices

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