controls should be explained after you need to use them, you need to move right before the one who watches tells you how.
in my opinion you could use both mouse buttons, one to smack and the other to shoot (it's faster than changing atacks).
i got stuck just right after falling down that pit with the roomba untill I knew that the chips gun, shoots in arch.
elevators are a bit buggy
I realised that you could shoot yourself and rewind your steps, even jump up gaps that you had fallen down, that could be a very interesting mechanic.
the game is playable, that alone, is already a lot of work, nice try. see you around :). I hope I helped.