It's meh. The graphics are ehh and the gameplay is repetitive. I would take out that pulse animation as well.

The pulsing is SUPER distracting but the concept is interesting

The core idea is fine, and I liked the music, but there were a few issues. The pulse was really cool, for about 10 seconds after which it started straining my eyes. I also found I was often spawning in new rooms on top of enemies, immediately damaging me and I didn't find the gun variety to matter all that much (more spread for machine guns, piercing for snipers, that kinda thing). That said is played smoothly, and the SFX was nice and punchy.

My favorite game I've played so far actually

Pretty fun and keeps you active. The graphics are a little boring and the pulsing could be smoother (It does add to feel making it more intense). Overall good job!