Just when I think the liminal space trend has become tired and dull, a project like this comes along and proves me wrong. After spending time milling around these spaces, I'm eager for more from Liminaut.
The story and sense of purpose that is hinted at in the Liminaut's hub is very intriguing and I'm interested in seeing what you add on top of the loop-like nature of your world-building. (What happens when a Liminaut brings an artifact back? I gotta know about cross contamination AHHHH!!)
If I may make a suggestion that might be of interest. Please take or leave it though because I love your instincts so far: I'd love to see less linear travel (A->B) in the excursions the Liminaut takes. What about different paths? Like, one of my fav things in a game is finding a weird/obscure path and seeing where that leads. In the green fog arch world, there's a path behind the player that leads to a ledge. I'd love to see you play with level design in this way! Even 'dropping' off the ledge could create a new path or detour!
All in all, excellent work Timbo! Can't wait to see what you do next. It's an honour of mine to see that lil alpaca in such a neat project.