Great game!
The thing that truly defines a great game is how long you can play it. Probably the only thing that kept me from giving this the full 10/10 was that I happened to die on the very last level! It can get hard with all those enemies and you have to have the best resolution for your computer. It was simply great fun to look for the different kinds of enemies and blown them all to pieces. It might have used a little more of a background, but there are just so many awesome things going on. I love how you can tell where the enemies and use rage mode and everything!