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The good:
It's a fun shooter, you get to upgrade in different ways, and you have a few different ways of playing. The graphics are good.
The bad:
I don't like how ammo or health packs slide along the floor after they are dropped, especially when there are spikes on the floor. The enemies were all too weak except for the floor spikes--if you remember to avoid the spikes at all cost you don't have any trouble. I also don't like how once you win you don't get to continue using your money earned. Also once you win you should be able to use BOTH of the other maws, not just one, and they should start out upgraded quite a bit to make it worth your while.