I was thinking lately, if only Marathon wouldn't have these insane switch puzzles, I'd really like another space-shooter. Then I suddenly find your game.
On the first level, I started without a weapon, so I have skirted around the room, slamming E to open one of these lockers and get a weapon. Then, ignoring the terminal, I've stumbled around blindly, until I have opened the wrong door, managed to fist an enemy to death then got killed in the fire.
Then I tried the tutorial and realized that there are terminals. The second attempt was a lot smoother. Maybe you should give a slight text popup, so numbskulls like myself can easily find the first terminal, and then they can keep looking for one.
Maybe you already know, but the healing station should get some SFX. Otherwise the sounds are good and meaty. The sound of guns, hit, and bodies hitting the floor.
Also you have some really nice promotional artwork for you game. You should update the main screenshot to catch more eyes.