Here's what I think:
・The game has some lag issues, even on great computers.
・The guns have very little difference except the damage with the occasional effect on certain guns.
・The NPCs are pretty lame. Almost everything is melee and they all seem to do the same thing: Run toward you. Spice it up a bit! Give ninjas shurikens. Give armored mice a single use throwing axe, anything really.
・Bosses have too much hp for the lack of a challenge they provide. I'll kill all of the mobs while focusing the boss and still have the 2nd phase of the boss alive and walking toward me.
・Bats should not KAW like birds. At all.
All in all, a decent game. Should you choose to update this at all, it could turn out pretty good.