I like it a lot
Although I do want more. I want the game to be longer, I noticed after I beat the last boss it just loops. I don't find the game too hard, or the ship too fast, at all. The physics seem pretty good. My biggest complaint is that the weapons don't stack. Also, once you die and return to your original weapon you are pretty much useless if you are futher in the game. It would also be nice if the items were randomly generated from dead enemies instead of appearing at set times and set kills.