pico-8 cartridge // http://www.pico-8.com
version 42
__lua__
function _init()
  game_over=false
  make_cave()
  make_player()
end

function _update()
  if (not game_over) then
    update_cave()
    move_player()
    check_hit()
  else
    if (btnp(5)) _init()
  end   
end

function _draw()
  cls()
  draw_cave()
  draw_player()
  
  if (game_over) then
    print("game over!",44,44,7)
    print("your scrore:"..player.score,34,54,7)
    print("press ❎ to play again!",18,72,6)
  else
    print("score:"..player.score,2,2,7)
  end
end

-->8
function make_player()
  player={}
  player.x=24
  player.y=60
  player.dy=0
  player.rise=1
  player.fall=2
  player.dead=3
  player.speed=2
  player.score=0
end

function draw_player()
	 sprite=1
  if (game_over) then
    sprite=player.dead
  elseif (player.dy<0) then
    sprite=player.rise
  else
    sprite=player.fall
  end
  spr(sprite,player.x,player.y)
end

function move_player()
  gravity=0.2
  player.dy+=gravity
  if (btnp(⬆️)) then
    player.dy-=3
    sfx(0)
  end
  player.y+=player.dy
  player.score+=player.speed
end

function check_hit()
  for i=player.x,player.x+7 do
    if (cave[i+1].top>player.y) or (cave[i+1].btm<player.y) then
       game_over=true
       sfx(1)
    end
  end
end

-->8
function make_cave()
  cave={{["top"]=4,["btm"]=119}}
  top=45
  btm=85
end

function update_cave()
  if(#cave>player.speed) then
    for i=1,player.speed do
      del(cave,cave[1])
    end
  end
  
  while (#cave<128) do
    local col={}
    local up=flr(rnd(7)-3)
    local down=flr(rnd(7)-3)
    col.top=mid(3,cave[#cave].top+up,top)
    col.btm=mid(btm,cave[#cave].btm+down,124)
    add(cave,col)
  end
end

function draw_cave()
  top_color=5
  btm_color=5
  for i=1,#cave do
    line(i-1,0,i-1,cave[i].top,top_color)
    line(i-1,127,i-1,cave[i].btm,btm_color)
  end
end
__gfx__
0000000000aaaa0000aaaa0000888800000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
000000000aaaaaa00aaaaaa008888880000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
00700700aa0aa0aaaa0aa0aa88888888000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
00077000aaaaaaaaaaaaaaaa88988988000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
00077000aaaaaaaaaaaaaaaa88888888000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
00700700aa0000aaaaa00aaa88899888000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
000000000aa00aa00aa00aa008988980000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
0000000000aaaa0000aaaa0000888800000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
__sfx__
000400001105012050000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
000a00002c05000000260501e0001f050070400704008040070300803008030070300801008010070100700000000000000000000000000000000000000000000000000000000000000000000000000000000000