I'm not sure how to 100% put this into words, but I feel as though I "peer into" the environment of a first-person game more than a typical third-person one. The latter carries more of a "characters on a stage" feeling to me, and provokes a different sensation while playing.

For this jam, I'd like to really meditate on that sensation of "peering into" the environment. When the player encounters something in the game, I want them to feel like they're almost reaching out towards it. I want to capitalize on the sensations of playing in first-person, even though I tend to gravitate more to third-person ones.

This is just an idea, but what about a game where you visit a museum and literally have to walk into the paintings as if they were portals?