Spoilers ahead!
I totally enjoyed the atmosphere of the game. The level design is cool and I liked the fact that for some enemies the light must be off and for others not, especially in the last run in room 202 even if I had to try it several times, I like a little challenge.
The only thing I didn't totally get is why the half table half witch creature doesn't hurt me in the light and instead it simply stays there still. In my opinion it would have been more effective if when you turn on the light it becomes just a plain old table. In my opinion that's also the part where the game is less related to the theme of the jam because the monsters are also real in the light so they are not a lie after all.
As you said, going into room 201 is useless, I didn't die but you can skip it and go on with the story. Also, when you come out of that room in the dark and you have to turn the light on the collider of the switch in the corridor is too near to the drawer's.
Overall I think these are all minor flaws.
Now, the art blew me away, it's simplistic but extremely effective and consistent throughout the game. I really liked the design for the main charachter and the enemies.
The sound effects are ok but some of them are annoying after a while.
This is a really good game, great work!!