Cool game! I ran into a bug in the last room on the web version so I tried the windows version and the same thing happened. The enemy AI seems to go a bit rogue and they wander into the corner of the room. I was still able to pull the lever and finish the game though so no big deal.
First I really enjoyed the art style, and especially enjoyed the gun reloading animation. Movement felt good, but I wish I could jump (although I know there's no real reason to jump, it felt like an old school shooter so I wanted to bunny hop around).
I think the enemies are a bit too easy, I didn't get hit. I think if they had a projectile or were a bit faster (with maybe bigger rooms) it could have been a bit more challenging.
The idea of using the power of the gun to unlock/power doors is really cool, I wish there was a bit more done with that concept - it seems like there could be something more to explore here.
Enjoyed the game, well done.