First of all. I LOVE this game. It's a like cross between Doom and Quake. Its great.

Two issues: 

1. The laser barriers can be really annoying especially when running around dodging enemies. I died so many times from them on level 3.

3. This game could use a quicksave. I keep replaying level 3 because I keep dying and its super long.

Fix those two, and you have a classic in the making!