I picked this up since it was finally on a (small) discount. Some impressions after about three hours:
The core mechanism is very clever, but fairly dry. Even some of the early puzzles are really hard, despite a really small state space. I’m staring at one monstrosity on the second island, and have no idea of how to even begin solving it.
The game really doesn’t explain or teach anything. Not even how to start a puzzle level. Let along how to win one. Better stumble around random levels randomly until one is declared solved. How do the physics work? Not explained; my understanding of that has already changed multiple times. I don’t know if you can even get off the first island without doing moves you fully expect to fail just to see whether they work after all. This is absolutely lovely, just like it was in the Witness. Though I’m sure some people won’t like it.
The grainy low-poly style is doing nothing for me, hasn’t been used in any particularly clever way so far, and occasionally obscures information in a non-interesting way. (I.e. I know the state of some game piece, but it’s temporarily hidden from view so I need to remember it rather than be able to see it).
There’s also some other design conceits where things are a lot more clunky than I’d like, and nothing interesting has been done with them. I’m guessing that’ll change at a later point, but already I feel e.g. that I’ve wasted a lot more time than I care in the overworld, no matter what they do with it later.
The game is crashing for me about every 10-15 minutes on two separate computers. Though that’s on Linux, can’t imagine they’d release it if the game was that unstable on Windows.
I’m finding it hard to recommend this over The Witness or Snakebird right now. But I’ll certainly put some more time into this if I can sort out the technical issues.