Sorry, but I have to agree with everyone else...
SAVE!!!!!!! Maybe you didn't want to add a save feature so it would be more challenging, but it's just frustrating. It's like playing a shit NES game where you only get one life and no matter how far you get in the game you still have to start from the beginning if you die. It seems that the difficulty is in how consistently you can circle around baddies rather than reflexes and aim. But besides that glaring flaw, the game's really fun. The weapons are a blast (no pun intended :P) to use and the visuals are great. Also, the blood is awesome. Oh yeah.