Great entry! I like the look and feel of the game.
To improve:
- Would have been really nice to have some music (either doom-like or metroid-like)
- The enemy respawns were a little annoying and odd. I often found my myself backing up in rooms in order to make space, only to walk out of the zone and de-spawn the enemies. The buzzing hum they make helps that somewhat, but it was also strange at times to hear the buzzing before seeing an enemy.