Check-list of things for my game and final idea

I have finalized my game idea now, It'll be a timed game where instead of the score going up every time you're hit that 'score' will be how much time it took to get through all the levels. I decided I want three levels and the purpose of each is to get back to your island by building a raft

Codes:

360 degree rotation using <- and -> arrow keys
Push forward and gradually slow down when up key is pressed
pick up knocked out penguins when walked into
automatically build raft when you have 6 penguins
random movement
timer
scoreboard
shooting
timer if you stand still too long, melt ice, dead.