Explore a garden with the arrow keys and tend it as you like.  Hold X to reset.

Based on Conway's Game of Life.

Entry for TweetTweetJam 4 made with PICO-8. This is the entire source code:

b,k=btn,8192::s::for a=0,k-1 do
poke(a+k*3,(rnd(4)))end
x=60
y=x::_::
if(b(5))goto s
for a=0,k do
n=0 for i=0,8 do
n+=peek(k*3+a+i/3+i%3*64-65)end
poke(a,n==9 and 3 or n==12 and peek(a))end
memcpy(k*3,0,k)print('웃',x,y,9)
if(b(0))x-=1
if(b(1))x+=1
if(b(2))y-=1
if(b(3))y+=1
goto _