Fun, but the game is out to get you. Falling down a pit loses a life, shooting exposives is sure to blow you up as well, and weapons with recoil blow you down pits and trying to recover is near impossible. Nevertheless, it's still fun. Nice work.
It's really easy, since there's no penalty for losing, but the ability to upgrade everything is just awesome. I love games where I can upgrade stuff, and this is pure gold for me. Five stars. :D