Not bad but. . .
This is a good game that needs better upgrades. Playing levels over and over again just to gain levels is nice but there are no other upgrades until you get to different worlds. That makes this game frustrating and kind of boring to tell you the truth. I have a ton of money that I can not use because there is nothing left to buy, but can not proceed because the levels are beyond my ships abilities! This makes the game seem very boring to me and that is unfortunate because this game is VERY well done other than the playability. More upgrades, more stats upgradeable is what I think this game needs to make the repeated play of levels more tolerable. Great art work though and the music is pretty cool as well.