Not a bad first game at all. Although the art definitely shows you're new to flash, it's relatively well animated (or at least better than I could do). The gameplay is standard, something that may be bad for an experienced game developer, but is not too shabby for a first game. The music also fit generally well with the rest of the game. Some things you could address (Withstanding the art) are the general lack of a replay button, something that all games need, and I found a glitch where there would always be enemies still flying on the screen when I was in buy mode. Not bad for a first game though.