Horror games are definitely a rare thing to see in a game jam, so I really appreciate you going for it and making one. There is a lot here that you clearly put a lot of effort into, and the game has a cool vibe/atmosphere that really makes it stand out!
With all that being said, I think you really have to be careful how you implement these types of obscure, "figure it out" games. Especially during a game jam where most of the people playing are probably playing multiple games in a row and may only play the game for a minute or two and move on to something else (Although how relevant of a concern that is probably varies from person to person).
I think having game mechanics that the player figures out through gameplay or experimentation is awesome, but personally I think the basic controls should always be made very clear to the player. You don't have to go into details about what everything does, but the player should at the very least know what buttons they'll be expected to press. You could just say on the game page, "1 through 3 keys to control flashlight". Then the player can figure out through experimenting what effect the different flashlights have on the game. I ended up just pressing all the keys on my keyboard to figure it out, which kind of ruins the sense of discovery a bit.
Overall though, good job! This is a really interesting take on the theme. I hope you liked working with Godot!