Once I got the hang of the controls I liked it! Shooting at enemies I couldn't fully see in the dark hallway was pretty cool.
In the room with the shotgun I think you forgot to add a killbox under the level -- I fell into the pit and got softlocked.
And it's probably a good idea to list the controls on the page, or some kind of tutorial popup -- had to restart to figure out how to pick up a gun for the first time.
All in all, pretty good for your first game jam, well done!