I liked the setting and the concept overall, I do think the execution is a bit harsh. It has too much dialogue (Shouldn't be bad itself, but in a Jam people is biased to play LOTS of game, and suddenly having to read so much to understand generates friction, which is not wanted for a Jam.)
I liked the sound effects and the polish of the first person movement though sadly the gun effects were not as satisfying. I think the biggest "sin" of this game, is the gun being too weak at the start or maybe that there is too much enemies? They were so many and they needed too much shoots even at x4. For being the core loop I think a safer bet would had beem to make it the priority in development:D