I've gotten a lot done since I started a few days ago. I've finished all the animations that I'll need for now (minus boss animations), the main character, and at least one of the enemies are done. I've completely finished the level layout and flow for the entire game, and the combat and basic AI are set up (there's still a bit of tweaking I'd like to do). Currently, you have 3 attacks, shooting your gun, smacking them on the head with your gun (which if you hit them when they aren't alert, it's an instant kill), and a crotch shot. I think that should be plenty for now. Also, when you alert an AI character, 3 more enemies will appear randomly through doors in the level. Each enemy can do this only once, and any enemy that appeared through a door will not alert other enemies.
The weapon's system is also set up, your gun is fully customizable. The only thing it needs is a graphical interface.
I'm going to keep hammering out the levels, once that's done the game should be almost finished.
@BeamSplash - You're absolutly right. Right now I'm tweaking the enemies. I can make some more powerful, some more reactive, but all in all, they have strength in numbers, and it's really easy to get overpowered if you aren't paying attention.