Overall, it's a good game, but I found too many shortcomings; therefore, it doesn't deserve anything more than 3.5 stars.

I'll start with the things that I actually liked about LIMBO.
First of all... the ambiance and sound design. You can really feel immersed in this title just by wearing headphones and letting the ambiance play for a while. It can be loud and unsettling, but also gentle and quiet when needed.

Next is level design (some of them, to be exact). The level designers did a good job in creating interesting and often non-obvious puzzles. Most of the time, they place us in an area with only a few objects, which really forces us to think.

There are also things that, in my personal opinion, are not really good, or sometimes even bad.
The main thing that bothers me is the later part of the game, specifically its difficulty and checkpoint placement.
The perfectly timed puzzles were cool as long as they didn't result in death, requiring you to walk all the way back to where you died. The idea is good, but the execution falls short.

In conclusion
Pros:
- Sound design
- Atmosphere
- Creative puzzles (most of them)
- Interesting world-building

Cons:
- Difficulty in the later stages of the game
- Checkpoint placement
- Ending

I expected something more, but it's still a cool game to buy (only on sale).