Unfortunately I get pretty bad motion sickness, so my experience playing was hampered a lot by the way the camera seems to constantly rotate. That said, I think this is a really cool idea, and could totally be explored further! A couple things I thought of while playing:
1. It feels weird that past goblins are able to phase through things like doors that were opened in a prior loop, but not yet opened in this loop. Allowing them to have collision with the environment would make timing things more of a puzzle (i.e. imagine how much differently a player would have to play if on loop 1 the goblin could easily and quickly get through a door, but because the player would have to unlock the door for them on loop 2, you may need to wait before entering the door on loop 1).
2. Highlighting things in the environment that are interactable makes it a lot easier for the player to get to the actual puzzle solving. When you don't do that, it can become a hide and seek before it ever gets to a puzzle because the player is looking for the lockpick/whatever other item. Not a huge deal for this jam version but if you extend it out that would be an important UX add.