I REALLY liked the camera and aiming. That felt really good. So did the camera shake and hit effects.
The gameplay was cool but is there a way to refill your water to shoot more? The first time through I just shot all my water before seeing an enemy, ran around the map, then just died because the enemy was the only thing I found. The second time I was extra judicious with my shots and still ran dry by the start of round three. I thought the sprinkler would refill my shots but it killed me instead. My third time through I was even MORE careful about wasting shots, and didn't have enough to defeat the sprinkler.
Restarting after losing on wave three force-closed the game both times I tried it. I don't know if there was meant to be sound, but it was eerie without it.
I really can't express how much I liked that camera though. I want to make sure you know that. The way it moved with the mouse and the player was fun. Like turning your head while your body moves forward.