It's a fun little concept for a game, and the graphics and music are top notch. I really, REALLY enjoy the music in this game and can recognize the Super Nintendo soundfonts you used to make most of it. Is there anywhere I can download the soundtrack? It really is amazing.
But, with all that said, there are some negative aspects to the game. As has probably been stated in other reviews, the guns feel too weak and there is no satisfaction in blowing up other drones, since they just kind of pathetically drop into the water - it would be more satisfying to see them explode in some way. Also, there doesn't appear to be an end goal to the game other than getting fully upgraded, and there isn't a score tally. These are things that I feel would much improve the game.