I really like the style of this game (silhouettes), but I can't really make anything nice out of it (it's bugged, too).
I think I'm going to keep the engine itself, but remove the whole upgrade part and replace it with a sidescrolling RPG or something.
As for ZIN:
Controls: LEFT and RIGHT for going forward/backward.
ENTER for upgrading
The upgrades are aweful; power doesnt do anything, speed can make you go at crazy speeds that cause the game to be all messed up, and recycling will make your "upgrading" a mess.
Also do not be suprised if the game breaks after a while