Thanks for playing and for the feedback!
I realize now that the raycast I’m using is also detecting one of the entity’s hidden hitboxes (the one used to detect the player and activate the chase or the jumpscare), which prevents you from interacting with anything else. It’s a simple fix, but I completely missed it.
The UV flashlight can be used to search for floppy disks in the level. They are quite rare and randomly generated, so you may have passed through a section that didn’t have many.
The last thing to unlock is the chicken after you leave the 4th treasure, so you’ve already seen all the content in the game. There are two cinematics, one for winning and one for losing all your lives in hard mode, but they only last 10 seconds.