It's been in my library for years and I didn't know much about it. Randomly started playing it a few days ago and I've been having a blast solving the puzzles. It's been a while since a game has really made me want to finish it and see what is at the ending.
I'm at the end now working on the final (I think) puzzle.
I got stuck on a level where you had to navigate a maze while evading suicide drones, then I turned my attention to other games out of frustration. I really enjoyed the puzzles up until that point, though!
I don’t remember exactly where I stopped but I had a similar experience. I was absolutely loving it until I just got completely stuck, spending a couple hours on a puzzle got boring. Would love to pick it up again someday when I have more time though.
I was a bit frustrated at that point because it got more like a twitchy video game and less like a puzzle game, if that makes any sense. I'd still like to finish it, though.