Stubbing out a game per the specs of my 4 year old.

stormtrooper_bear.p8

pico-8 cartridge // http://www.pico-8.com
version 18
__lua__
--stormtrooper bear
--ryan parsley

function _init()
 t = 0
 game_win=false
 game_over=false

  // xy change per button val
  dirx = {-1,1,0,0}
  diry = {0,0,-1,1}

 tiles={
  wall=0,
  door=1,
  key=2,
  enemy=3,
  food=4,
  goal=7
 }

 draw = draw_game

 make_player()
end

function _update60()
 t+=1
 if (not game_over) then
  check_win_lose()
  move_player()
 else
  if (btnp(❎)) extcmd("reset")
 end
end

function _draw()
 cls()
 draw()
end

function draw_game()
  cls()
  draw_map()
  draw_player(p.direction == 'west')
end

-->8
--map

function draw_map()
 mapx=flr(p.x/16)*16
 mapy=flr(p.y/16)*16
 camera(mapx*8,mapy*8)
 map(0,0,0,0,128,64)
end

function is_tile(tile_type,x,y)
 tile=mget(x,y)
 has_flag=fget(tile, tile_type)
 return has_flag
end

function can_move(x,y)
 return not is_tile(tiles.wall,x,y)
end

function swap_tile(x,y)
 tile=mget(x,y)
 mset(x,y,tile+1)
end

function unswap_tile(x,y)
 tile=mget(x,y)
 mset(x,y,tile-1)
end

function get_key(x,y)
 p.keys+=1
 swap_tile(x,y)
 sfx(2)
end

function open_door(x,y)
 p.keys-=1
 swap_tile(x,y)
 sfx(1)
end

-->8
--player

function make_player()
 p={
  x = 3,
  y = 5,
  x_offset = 0, // smooths transitions
  y_offset = 0,
  keys = 0,
  sprite = 1,
  animation = {2,2,3,5},
  direction = 'east'
 }
end

function draw_player(flip)
  spr(get_frame(p.animation),p.x*8,p.y*8, 1, 1, flip)
end

function get_frame(frames)
 return frames[flr(t/15)%#frames+1]
end

function move_player()
 // copy pending validation
 newx=p.x
 newy=p.y

 // loop over button values
 for i=0,3 do
  if btnp(i) then
    newx+=dirx[i+1]
    newy+=diry[i+1]
    if (newx < p.x) p.direction = 'west'
    if (newx > p.x) p.direction = 'east'
    p.x_offset=-dirx[i+1]*8
    p.y_offset=-diry[i+1]*8
  end
 end

interact(newx,newy)

 if (can_move(newx,newy)) then
  p.x=mid(0,newx,127)
  p.y=mid(0,newy,63)
 else
  sfx(0)
 end
end

function interact(x,y)
 if (is_tile(tiles.key,x,y)) then
  get_key(x,y)
 end
 if (is_tile(tiles.door,x,y) and p.keys>0) then
  open_door(x,y)
 end
end

-->8
--win/lose code

function check_win_lose()
 if (is_tile(tiles.goal,p.x,p.y)) then
  game_win=true
  game_over=true
  draw=draw_win_lose
 end
 if (is_tile(tiles.enemy,p.x,p.y)) then
  game_win=false
  game_over=true
  draw=draw_win_lose
 end
end

function draw_win_lose()
 camera()
 if (game_win) then
  print("★ you win! ★",37,64,7)
 else
  print("game over! :(",38,64,7)
 end
 print("press ❎ to play again",20,72,5)
end

__gfx__
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__gff__
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__map__
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__sfx__
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