Playing "Manifold Garden" (https://manifold.garden/) and I can see that it's going to be one of Those Kinds of Game™.
Finished the first (blue) area. Saw a pretty cube. Went "awesome". Walked through the open door. Walked through a building and out the other side to a place with lots of long pillar worlds. Spent the next 15 minutes COMPLETELY LOST because every one I hit was covered in black goo and had no doors, no cubes, only a receptacle for a cube.
Read some posts from other confused gamers and EVENTUALLY find out that that's the hub world and I'm missing something called a "god cube". I've been aimlessly wandering around an area that I've not unlocked yet, not knowing how to unlock the next area. Or even knowing where it is.
So I've got to switch back to the "right" gravity (which, yeah, I noticed that the colours changed, but I didn't connect "blue way up" with "completed blue world"), go back through that building, and PICK UP that cube and put it in the receptacle in the hub area. I've basically been seeing the finish zones for each area and not knowing what to do 
Still, the puzzles are clever and the world flipping is fun. Nothing too terribly difficult yet. But I can see that it's going to be like Talos Principle and Witness and Taiji where you can readily miss something and get to "WTF is this and where am I going?" with no apparent environmental clues about what's wrong.