I cannot recommend this game because I found it much more frustating than anything else.
There are some quite good things about this game:
* the art style is quite reminiscent of Limbo, largely murky greyscale (not much use of sharp contrasting black and white) with and the ocassional splash of red which makes it a bit less dull. The game is a 2d platformer but the background and foreground that you can't interact with are used well to conjure the world and tell the story
* the menu allows you to revisit bits of the game that you've already completed, so if you've missed collecting secrets or want to replay a bit you liked then you can do that without needing to replay through from the beginning.
* check points are spaced fairly closely together, so when you die you usually don't lose too much progress.
But mostly I'm afraid that I found it a frustrating experience, without much fun.
* No attempt to develop connection to brother
The main gimmick of this game is that your brother has broken his leg, and cannot walk so you must carry him everywhere, and because he is afraid of the dark you can only put him down in (very infrequent) spotlights. Because do not spend much time with your brother before he breaks his leg you don't develop much connection to him. He makes you jump less high and he basically just feels like a burden, because he does nothing for you, and doesn't interact with you very much.
The story would have much more impact if your brother had more depth, if he had a personality and you could develop a connection to him, instead of just feeling like he's a burden.
* Long reload times and not infrequent deaths
Each time you die it takes about 5 seconds to reload. That is quite frustrating in and of itself, but it is also quite easy to die, some of the jumping puzzles require a fair amount of precision, and some of the puzzles require a bit of experimentation to see how things work, so unless you are pyschic you won't work out how to solve it without dying at least once.
* Bugs - not many
The game is a little buggy, a few times I have passed through walls and floors that I shouldn't have been able to, but it doesn't happen so often that this is a big problem. Dying takes you back to the latest checkpoint which isn't far away, and solves any problem that the bug would have caused.
* Slow and unfun controls
Platformers often have characters who are very nimble and are fun to control, and much of the fun comes from the sense of agility that the game gives you. In this game your character is a bit slow, and while you are carrying your brother you can jump less high.
In Limbo, and to some extent this game, the unfun controls to some extent serves to make you feel less powerful than you normally do in platformers. In Limbo that feeling of powerfulness and lack of fun emphasises what the game is about. Here it also makes you feel not very powerful, but less so than Limbo because you can still make a jump equal to your height even when carrying your brother. So while there are design reasons for these limits on your abilities the effect makes you feel weak, but not really that much, and is still not fun.
* Punishing puzzles
Almost all of the puzzles are not very difficult, and can be solved mostly through trial and error, but some are rather fussy about their timing and it often feels like the fault of the controls that you fail.
In a lot of platformers you have a range of abilities and solving puzzles involves combining them in an interesting way. Here you can only run and jump, which limits the range of puzzles/challenges to timing/precision based puzzles (which the slow controls don't really lend themselves to), and interacting with objects.
As I said above the puzzles often require experimentation, which is okay in and of itself, but you will die quite a few times because of this and the slow pace, unfun controls and long reload times make the puzzle solving feel more chorish than fun. Often you quickly workout the key idea of the puzzle, but sorting out the details involves dying a few times, and repeating the bits you've already done.
* No camera control
It is quite helpful in platforming games to look up or down, so you can tell where you need to go next, but here you have no control. So sometimes you make leaps downward to explore and maybe find a secret, but you just die.
* Short - I completed the game in 7 hours
I do not think that this is a big deal: Short experiences can be much more rewarding than some longer experiences. But some people do think this important, so I feel it should be mentioned.
This game is by no means terrible, and if you can forgive unfun controls for pretty art and an okay story then it might be worth getting this game. But even then I think there are games out there that do that better.