For a 3D platformer the games controls are, to say the least, lackluster. There's a jump, a dash, and the ability to merge onto walls that have light on them. Aside, from these there's the ability to dash in the air and that's really it, unlike most other 3D platformers you don't really have a progression with more abilities added on or building on concepts. Luckily, it doesn't have the same issue as many other 3D platformers in that the camera doesn't fight against you a lot, though there are still moments of it.
If you like to go fast, the dash is slightly faster than the walking speed so you'll probably end up just spamming the button to move around (With the exception of going down slopes as the time it takes to fall after each dash on the slope is often longer than just walking down.).
The puzzles are often very easy, almost as if this game was designed for children. With the final level being an exception. In that chapter, instead of being too easy the puzzles are then made to be super vague and it seems like this portion was rushed as it lacks in polish compared to the rest of the game.
As a bit of a side note, I managed to bruteforce my way through most jumping puzzles by abusing the dash in the game (You can dash as you unmerge from a wall and this lead to dashing while merged on a wall then unmerging and dashing.)
By contrast, the story is very mature with a lot of talk about divorce, murder, and the like (Spoiler: There's even a scene where the little girl's mother attempts to kill her husband.
). So that assures me that this game isn't meant for children.
Like it's been said, this game can be 100% in a very short time. I beat the game with around 80% completion in about an hour and a half. It then took about another half hour to tie up the other achievements I missed. So you will not be getting a whole lot of time out of this game.
I'd say there's one thing that makes this game fall short and that's it's lack of freedom and lack of replayability.
Now let me explain what I mean by lack of freedom, the game feels like it might be an open world, or even Banjo Kazooie or Mario 64-esque hub world with stages, at first, but you soon realize it's a linear story with chapters and many many invisible walls. In the first area if you explore you can find the secret room with the donator names and I was hoping there would be more secrets like this as the game went on, but no that's the only really optional area in the game. Aside from that there are the lumes(?) spread around in the world and a completionist would want to go an collect those, but you only need about half of the lumes in a given area to proceed. This brings forth the question, why are there so many when you need so few?
Onto the lack of replayability, the whole reason to play this game is for the story. The gameplay is decent, but what is going to keep people playing is the story of the game. Once you know the story there's no reason to come back to it.
I was going to go back and try a speedrun of the game, but the amount of cutscenes and unskippable dialouge killed it for me. I'm certain there's plenty of ways to break the game, skip event triggers, and the like, but I don't want to put that much work into a game that, frankly, I don't like that much.
Edit: If you disagree with me, please feel free to comment on the review and discuss it. I'm more than open to take debate on why people think this game is good. I wanted to love the game, but it just wasn't there for me.