woot!
awesome game, but hindered by several issues: theres no pause button, so you have to wait to the end of the level to get a break, no mute button which is annoying if you wanna listen to your own stuff, and theres also a bit of a bug with your hittesting: quite often, your bullets will go straight through the bombers and not kill them. Theres sometimes a bit of a long wait between one enemy and the next, too.
Despite those 'problems', its one of the best games i've played on ng. You should seriously think about making proper, full-length games to sell.