02 Lanes

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// LANES: dodge the blocks, grab cyan charges to phase through one.
let R = Math.random, M = Math.min;
let t = 0, dead = 2, L = 2, px = 160, s = 2, d = 0, score = 0, charge = 0, shake = 0;
let cells = [], parts = [], au, best = +localStorage.lanes1k || 0;
// clamp to lanes 0..4
let lane = x => x < 0 ? 0 : M(4, x);
// particle burst
let boom = (x, y, n) => { while (n--) parts.push([x, y, R() * 6 - 3, R() * 6 - 3, 20]); };

onkeydown = onpointerdown = e => {
  let k = e.keyCode;
  if (e.repeat) return;
  if (dead) { if (t > 30 || dead > 1) cells = [], score = t = dead = charge = 0, L = 2; }
  // keys: arrows / A D; pointer: half of the canvas
  else L = lane(L + (k ? (k == 39 | k == 68) - (k == 37 | k == 65) : e.offsetX * 2 > a.clientWidth ? 1 : -1));
};

setInterval(() => {
  t++;
  c.setTransform(1, 0, 0, 1, (R() - .5) * shake, (R() - .5) * shake);
  shake *= .9;
  c.fillStyle = 'rgba(11,11,16,.4)';
  c.fillRect(-9, -9, 340, 200);
  // speed ramps over ~60s; frozen after a crash
  let v = dead > 1 ? 3 : dead ? 0 : M(6, 2 + t / 900);
  px += (104 + 28 * L - px) * .35;
  if (!dead) score = t / 10;

  // spawn a row: the safe lane drifts at most 1 lane per row, so a path always exists
  if ((d += v) > 48) {
    d = 0;
    s = lane(s + (R() * 3 | 0) - 1);
    // cell kind: 1 block, 2 charge (only in the safe lane)
    for (let i = 0; i < 5; i++) if (i == s ? R() < .2 : R() < M(.8, .35 + t / 9000)) cells.push([104 + 28 * i, -14, i == s ? 2 : 1]);
  }

  for (let q of cells) {
    q[1] += v;
    c.fillStyle = q[2] > 1 ? '#3fe0ff' : '#ff4f6d';
    c.fillRect(q[0] - 12, q[1], 24, 14);
    if (!dead && Math.abs(px - q[0]) < 17 && q[1] > 136 && q[1] < 162) {
      if (q[2] > 1) charge = 1;
      else if (charge) charge = 0, shake = 5, boom(q[0], q[1], 12);
      else {
        dead = 1; t = 0; shake = 12; boom(px, 154, 40);
        localStorage.lanes1k = best = score > best ? score | 0 : best;
      }
      q[2] = 0;
    }
  }
  cells = cells.filter(q => q[2] && q[1] < 180);

  c.fillStyle = '#e9e7df';
  parts = parts.filter(q => (q[0] += q[2], q[1] += q[3], c.fillRect(q[0], q[1], 2, 2), --q[4] > 0));

  // ship turns white while it holds a charge
  c.fillStyle = charge ? '#fff' : '#3fe0ff';
  if (dead != 1) c.fillRect(px - 5, 148, 10, 14);
  c.fillStyle = '#e9e7df';
  if (dead) c.fillText((dead > 1 ? 'LANES' : 'CRASH') + ' · TAP TO START', 160, 64);
  c.fillText((score | 0) + '  HI ' + best, 160, 20);
}, 16);