I do not review games on steam, but this, this is something special. I cannot put into words how perfectly crafted the atmosphere for this game is. The puzzles, everything, is amazing and all, but I could spend all day walking around this game. The sound design is perfectly done, fading in and out seamlessly between areas, always fitting the vibe of whatever area your in. And just the visuals are stunning, if you like fractals, you'll love this game, period. But even beyond that, the sheer scale of everything around you and god, I can't stress the atmosphere enough. This game is a ♥♥♥♥♥♥♥ masterpiece, by far my favorite visual game, well worth every penny of the $20 I paid, even considering the short playtime.

As for the puzzles however, they certainly can be tricky, but if you're looking for a puzzle game, I would strongly recommend looking elsewhere as there are only a few really tough puzzles and some "I can't find what I need to solve it" puzzles

TL;DR
if you like fractals, buy this game.
if you like games that give you a sense of awe and goosebumps, buy this game.
if you like well-crafted atmosphere walking simulators, buy this game.
if you're looking for purely a puzzle game, look somewhere else.