JS1k: The JavaScript code golfing competition

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// Bitmage - js1k 2017
//
// You are a yellow bitmage exploring dungeons.  You love finding delicious blue
// mana that you consume hoping to grow stronger.  As a member of the
// kingdom of fungi you are able to secrete an acidic venom that digests all
// material around you. A useful skill in these areas.
//
// Lately the green slime have been getting on your nerves.  They do not obey
// the same rules as you and too often they are hostile.  It is time to teach
// them a lesson!
//
//   "Green slime are the most tricky part about being a bitmage.  They follow
//    me everywhere I go, impossible to get rid of.  I am not sure they want to
//    harm me but experience has taught me to take no chances.  Sometimes
//    confronting them head on is the best approach."  
//
// Objective
//
//   Avoid crossing the green slime, collect mana
//   and see if you can get the highest score.
//
// Controls
//
//   Arrows keys to move
//   Space to cast digestive secretion spell
//   Enter to continue
//
// Scoring
//
//   Find mana:        3 points
//   Confront slime:   5 points
//   Blast slime       9 points
//   Complete level:  20 points
//
// TODO
//
// * Better AI
// * wrap around properly
// * Deterministic randomness
// * Place enemies better
// * Colors
// * Save more bytes

var win = window
var height = win.innerHeight
var w = 40
var g = height / w | 0
var x
var y
var dx
var dy
var i
var j
var ii
var jj
var pos
var died = w
var points
var bomb
var baddies
var mana = 3
var completed = 1
var level = 0
//            floor   boom     wall   enemy    died    bomb    player
var colors = ['#333', '#555', '#222', '#384', '#B44', '#55d', '#A82']
var dungeon
var bg = dungeon = []

function r1 () {
  return 200 * (Math.random() - 0.5) | 0
}

points = bomb = 0

var args = [w, -w, -1, 1, 0]
var moved

const FLOOR = 0
const BOOM = 1
const WALL = 2
const ENEMY = 3
const DIED = 4
const BOMB = 5
const PLAYER = 6

function xx (ev) {
  // Player
  ev = ev.which
  dx = ev == 37 ? -1 : ev == 39 ? 1 : 0
  dy = ev == 38 ? -1 : ev == w ? 1 : 0
  bomb = ev == 32 ? 1 : 0

  if (completed | died) {
    if (completed) level ++
    else level = 1, mana = 3
    // make dungeon
    i = w * w
    for (;i--;) dungeon[i] = r1() > 9 + 9 * level ? WALL : FLOOR
    x = y = w / 2

    // place baddies and bombs
    bomb = 2 + level
    baddies = bomb + level
    i = w * w
    // at higher levels bombs and baddies become more separated
    for (;i--;) if (dungeon[i] < WALL) {
      if (baddies && r1() > 99 - level) baddies--, dungeon[i] = ENEMY
      if (bomb && r1() > 99 - level) bomb--, dungeon[w * w - i] = BOMB
    }
    dungeon[x + y * w] = PLAYER
    if (died != w && ev != 13) return
    completed = died = 0
    bg = []
  }

  pos = x + dx + (y + dy) * w
  if (bomb + dx + dy && pos > 0 && pos < w*w && dungeon[pos] != WALL) {
    if (dungeon[pos] == BOMB) points += 3, mana ++
    if (dungeon[pos] == ENEMY) points += 5
    if (bomb && mana) {
      mana--
      jj = 20
      for (;jj--;) 
          ii = pos + args[jj % 4] + args[jj % 5],
          points += dungeon[ii] == ENEMY ? 9 : 0,
          bomb = bg[ii] = dungeon[ii] = BOOM
    }
    ii = x + y * w
    dungeon[ii] = bg[ii] || FLOOR
    dungeon[pos] = PLAYER
    x = x + dx
    y = y + dy
    moved = {}
    for (i = w; i--;) {
      for (j = w; j--;) {
        if (dungeon[j + i * w] == ENEMY & !moved[j + i * w]) {
          // move enemy
          dx = x - j
          dy = y - i

          if (dx * dx + dy * dy < 2) dungeon[x + y * w] = died = DIED

          pos = j + i * w

          dy = dy > 1 ? 1 : dy < -1 ? -1 : 0
          dx = dx > 1 ? 1 : dx < -1 ? -1 : 0

          jj = w
          ii = j + dx + (i + dy) * w
          while (jj-- && dungeon[ii] > BOOM) ii = pos + args[r1() % 4]
          dungeon[pos] = bg[pos] || FLOOR
          dungeon[ii] = ENEMY
          moved[ii] = 1
        }
      }
    }
    // All baddies killed?
    completed = !moved[ii]
  }

  // Paint stuff
  for (i = w; i--;) {
    for (j = w; j--;) {
      c.fillStyle = colors[dungeon[j + i * w]];
      c.fillRect(j * g, i * g, g, g);
    }
  }
  c.fillStyle = colors[6]
  c.font = (2 * g | 0) + 'px Arial'

  if (points >= ~~win.localStorage.h) win.localStorage.h = points
  c.fillText('Mana ' + mana + '  Level ' + level + '  Score ' + points + 
             '  Best ' + win.localStorage.h, 9, w * g - 9)

  if (died) points = 0, c.fillText('Sad', g * w / 3, g * w / 2)
  else if (completed) c.fillText('Joy', g * w / 3, g * w / 2), points += 20
}

d.onkeydown = xx
xx(d)