One of those games where simple rules can add up to very tricky puzzles.
It's vaguely similar to a "sliding blocks on ice" puzzle, but with magnets rather than pushing, and in three dimensions…
Then, on top of that, the other challenge in each puzzle is that the environments are all incredibly reflective, turning each room into a hall of mirrors that it can be difficult to even visually parse until you've traveled around it enough to build up a mental map of the room's actual shape, figuring out what's real and what's just a reflection!
Most of the puzzles I was eventually able to understand and reason out a solution to, although a couple of them never quite made sense to me and I wound up just solving by poking through the possibilities until things worked out. But, you're never rushed—nothing in the game ever relies on time, it sits and waits for you to analyse the environment and choose your next action. There is one final level that's unlocked for completing each level in a small enough number of clicks, but even then, you can take all the time you need between those clicks, making it a good game for people who don't like having their reflexes tested. (I've heard on the forums that some people have found alternate solutions that require rapid clicking, but these are optional and not the intended solutions, so you aren't missing out on anything by not playing that way.)
Movement is of the no-such-thing-as-down variety, like a spaceship game, with six degrees of freedom, but personally I didn't struggle much with acclimating to it? The rooms all either have pretty obvious landmarks to orient yourself to, or else are symmetrical enough that your orientation is irrelevant anyway. It's the sort of thing that I could see causing someone motion sickness—particularly when the game plays with extreme-fisheye viewpoints, which do occasionally get VERY extreme—but personally, I'm fairly sensitive to motion sickness from games, and I had no trouble with this one at all. The fact that you're always in total control of your movement seems to help.
The game is consistently as gorgeous as the screenshots suggest—maybe moreso in motion, as you're swooping through the environments at will. This comes at a cost in performance of course; I occasionally dropped to what felt like 15fps or lower on my GTX970, but again, this isn't the sort of game where that matters beyond the cosmetic experience of the shuddering. I did also have a fair amount of trouble with the game crashing and audio breaking up, but the game autosaves after each level, and while there are usually multiple goals to achieve before a level ends, for the most part it's easy to repeat a solution that you'd probably just done a few moments prior to the crash, once you've already figured it out.
All that to say, this is a gorgeous puzzle game that strikes a nice balance with its difficulty!
