This was a really nice. I loved the game running in the TV. (I made the same choice.) I also enjoyed the pulse-pounding music. The trick-or-treater scene outside the door was cute too.
The pace of the game felt rather slow because the player moved very slowly, and it was hard to avoid the mimics. In fact, I didn't realize I was being eaten by them at first because I didn't see the animation of them or see my health go down. I was just getting teleported back to the start and then dying randomly from opening chest it seemed at first. A sound effect and a little delay to see the mimic attack would've helped. The game felt a bit like playing Russian Roulette until you found the right chest which wasn't super fun.
Overall, this was a great entry for your first jam! Well done!