From a gamedev perspective good job. The game seems very polished and well designed. One small bug I ran into was when I had a gun on the ground and a portal spawned too near it so I couldn't see what it was because when I tried I got teleported.
From a player's perspective I'm not a fan of tight corridors for bullet dodging. My run ended when I was met with a huge group of eyeballs and no space to dodge the projectiles. The weapon upgrades seemed rather unsatisfying. Maybe I had bad luck but I kept getting the no piercing upgrade when all my guns had 0 pierce and the other upgrade was always something minor that didn't feel like it made much of a difference.
Also checked out your Steam page and I have to say it is nice. You've done a good job with that.