very nice game
looks very good, gameplay feels nice but could use a little tweaking IMO.
the lowest level firepower was just too weak, and falling back from the higher levels after a certain time was kinda annoying, I think it would be better when if you get shot, there would be a chance of your weaponry getting damaged, meaning you drop a level, rather than just dropping after a certain amount of time.
I'm hoping your going to tweak it up because changing some simple gameplay elements would improve it dratically.