I thought the first half was okay, but the second I fell through the floor with no flashlight and was made to wander around in dark, featureless hallways for the second part of the game, I checked out and quit.

https://www.youtube.com/watch?v=yraibRl67O8

I think you definitely need a light source on night 3. The tunnels need more decoration so it's not so easy to get lost. It all really falls apart the second you get out of the bedroom, tbh. The jump scare one hit kill happened so quickly I didn't even get to see what the monster looked like. I'd say, expand on the beginning, and completely ditch the second half.

Keep up the good work, I don't mean to sound mean—indie devving isn't easy!