I've only played the first 3 levels: It would be scarier if the creatures were more "animated" instead of this still picture slowly stalking you. Also, dying in blood instead of a could of smoke would be scarier too. Bravo for the effort!
A couple of suggestions:
-There needs to be a pause button so your hand doesn't fall off.
-The machine gun should have another upgrade so it can shoot through multiple targets at the same time. When you have 3 in your sight, it sucks when you kill the slow one and that fast bastid gets through.
-You should have a level progress bar at the top so we know when the end is coming.
Other than that, nice game! :-)
It wasn't exactly the easiest when it came to clicking on the monsters. You seem to MUST click on the center of the monster rather than just clicking it pretty much anywhere. I would strongly urge the developer to fix this issue. Other than that, it's a fun game to kill a few minutes.
Another bug to look at: After you beat the Ultimate Champion, (the skeleton thing) and it challenges you to fight again when the yellow exclamation comes up on your Training Mode screen, when I click Accept, a pop up window comes up and the game won't go on and freezes up.