Pretty Good
Pros: I liked the variety of weapons and monsters. The leveling up of the weapons was cool as well, and the game ran smoothly.
Cons: The game was much to short and much to easy. I beat it the first try barely losing any health. Perhaps adding in a kind of difficulty setting if possible would make things more challenging. I found myself simply running in circles firing and no one would be able to touch me, I didn't even use the rocket launcher. The area of the game was small as well.
Looks like you have to grounds to keep building a great game. good luck.