It was an ok couple of minutes to play. It wasn't bad, but there were a lot of things that could use further playtesting and polish. I think the UI and the last level needed a bit more work, as it was honestly unappealing and hard to see anything. I would also like to add onto what Robin Six said about no landmarks in the map, as having the player clear out all the rooms but have the teleporter randomly on the map makes backtracking a pain.
This isn't a bad game at all and with some more time and assets I think this could turn out to be a fun little dungeon shooter, but I won't lie and say I wasn't a bit disapointed. Congrats on the finished game though, and I found the sound effects for enemy shooting really funny. I also liked the buff and debuff system, I think there's a lot of potential in that.