I like the aesthetic of your game. The voxel vibe is cool, and I thought it was an interesting choice to make your gun shoot physical bullets rather than do raycasts
I think the feel of the gameplay would improve a lot if you could get feedback on when you damage enemies. I didn't even know I was hurting the first enemy until I shot it enough to explode. When I went to the upper right room those fast enemies were way too strong and fast to take on with a pistol so they took me out fast without feeling like a fair fight.
But yeah, nice model design, I like those cryogenic tanks in particular.