I write this review as a casual, recreational gamer.
It's beautiful, got an interesting gimmick and nostalgic feel to it. There's no game over, which is an interesting design choice I can get behind of, but those black holes are annoying obstacles that add nothing to the game but frustration. It is utterly enigmatic if you're planning on playing to completion, and the fact you have to get out of the game or rely on other devices to solve some of the mysteries (like those QR codes kind of thing) was a major turn off. I was led to believe this was a peaceful platformer focused on puzzle-solving, but the game can be quite unforgiving sometimes. It forces you to pay attention, and the untidy layout of the rooms leave you with a plethora of clues to be tried on a plethora of rooms, and you'll never know what refers to what until you accidentally get one of your hunches right.
The map is huge, which, in a way, is a positive thing, but traveling through it is confusing and annoying, given the fact you can't just fast travel to a certain room; you have to make your way over there through all the other rooms... This can be frustrating since the map is quite confusing -- it looks great and unique, but you never know which door leads where unless you try one by one. There are so many doors and rooms it is easy to forget which door leads where even after you been through it several times.
It's an incredible game, but the overall experience I had with it was very frustrating and that it was, ultimately a waste of my time. More than once I felt like breaking the controller in my own head, so infuriated I was. I feel this game caters to a very specific audience, so if you're not in for a challenge (or spending a lot of time and effort into it), you'd better off with some other game. I usually try to get all achievements in games, but this one felt like too much work, and I didn't want to rely on a guide; what's the point of playing a game if you're going to replicate the steps described in a guide? If you play games to relax at the end of a long day, I don't reccommend it. Teenagers and core gamers would find this more appealing.
If you're not an achievement collector, the first playthrough is interesting and free of difficult challenges, but you won't be able to visit several rooms, some of which are only available after finishing the game once. A great part of the game will remain undiscovered, which shortens the play time and affects willingness to invest on its full price, after all, if you're only going to visit half of the rooms, what's the point of paying for the full experience?
I don't ask for hand-holding, but it feels to me like it lacks serious consistency, leaving the gimmick as the only redeeming factor about it.