I enjoyed the level design that was there, which I was able to walk around the level and explore which was fun to find different things and areas. I also liked the particle effects that were present on the gun itself.
Only problems here would be that the level design does feel a bit weird with you walking through things, the AI or player cannot take damage yet there is a health bar and that the mouse wasn't locked in the gameplay, which was annoying as the mouse could click on something that I didn't want.
Only issue would be the room where you can easily fall out of the map. Also the gun just being in the air instead of being with the player, which can look weird.
This game is enjoyable to move around and explore the map in it's entirety.