It's an amazing game. Every time I thought I understood what needed to be done to move on, I found myself on a different level, although I performed the same actions. I think I've managed to break the sequence of levels a couple of times, BUT I CAN'T EVEN BE SURE, because that's probably how it was intended.
The LOOP theme is really well conveyed. You have to remember what you need to do to get through.
I think the turning point in this regard for me was (I think 6-7) level, where you need to start thinking differently. Rather than just trying to walk towards the end of the level.
Excellent