Whoa, awesome, like a console game
This game's got potential. One suggestion I'd make it create a health bar for the monsters. It was a little annoying to be shooting at the monster and not know how much damage I was doing.
Also, some kind of map would be useful. The game in its current state isn't hard to navigate, but I imagine the final product will be much more expansive.
The voice at the beginning was mediocre at best. There are literally hundreds of amateur voice actors you can draw talent from for free at the Voice Acting Alliance or even here on NewGrounds, I suggest you check that out.
That's all I gotta say, I can't wait to see what happens next