Very fun game. I'm only sad it isn't longer. The mechanics are solid, I like the semi-jokey way you get the autofire, and the mobs provided a great progression in danger. If I would suggest anything, aside from a longer game, I'd suggest separating SFX and music to two slider bars; the music was good, but I personally like to have the music at a lower volume so I can more easily hear the SFX.
Looking forward to the sequel, which I hope there will be, and any other games you create in the future.