I loved the game a lot. The only big minus for me is how easily the game becomes repetitive.
Art-wise, the spaceship is awesome, especially because of the little intro animation, but the rest are much less good.
The idea behind the game is probably the biggest plus - I've never seen something like this, personally. A spaceship scroller usually packs up some guns and enemies too, but this doesn't go down this easy route!
Great job. Keep on fighting!!