I didn't read your In what does your game fit the theme comment before I played the game. So at first I was like "how does this fit the theme?" and then I got the power ups. My ship got stronger (and bigger) and I was hooked (just like the other ship on my initial ship)! I had choice if I wanted extra life or I wanted bombs. Of course I went with the bombs and it made the game so much better. It is easy to get into it, but it gets more advanced when you get more power ups.
Great game and good job. Everything from art to gameplay were fantastic! =D