Recs.
Updated
SpecsUpdate
Pros
Pro Does not become frustrating even if you die a lot
Most players die a lot in Limbo. fortunately this does not translate to a frustrating experience while playing the game. If you die from a trap, the game immediately reloads and takes the character right before reaching that very same puzzle. This way you can try again immediately and find a solution.
Pro Was developed with human psychology and neurological reflexes in mind
This game has very deliberate ways of mindscrewing with ANY player. There are tens of examples of such situations, the most obvious ones, subtle as they may be, pale in comparison to the ones that take a quite a while to discover since the patterns - much like the game's puzzles and situations - never repeat!
(Hint: here's the easiest one - SPOILER WARNING! When the spider gets you and wraps you up for later, you escape while body still wrapped up in it's web and your movement is limited and non-precise; namely, you hop slightly to move precisely or hop heavily to move quickly. The spider starts chasing you and you get on top of what turns out to be a giant round Boulder that starts rolling and you need to ride it so as to not fall off and not be crushed underneath it. To remain stationary is not an option. To move in slight hops doesn't give you enough distance and to hop harder means falling off as well if not careful with distance and timing. The entire situation springs up so suddenly but is so cartoony and instantly understandable that most players would instinctively start times jumping left so as to stay atop the boulder. However, from the left appears the spider, crawling on the ceiling and chasing behind you. One of the best animations of the spider can be seen right then and there - it's made to feel as repulsive and malevolent. And all of a sudden, the instinct to get away from the spider and the instinct to hop backwards to keep on top of the rolling boulder clash to a subtly disturbing effect.
The game is RIDDLED with moments that do that type of thing to you from start to finish and this is NOT accidental -somebody knew their psychology of subconsciousness and their neurological instinct triggers in humans. And used them geniously!
Pro Manages to communicate circumstance and casualty in a unique way
Being completely devoid of text, dialogue, and explanation Limbo manages to communicate circumstance and casualty to the player in a simple way not found in other games.
Having a game completely devoid of those three things is hard but Limbo manages to pull it off perfectly.
Pro Astonishing sound design
The sound design is simply great. Even though there's virtually no soundtrack to speak of, the sound effects do a great job of creating the perfect atmosphere in which the players immerse themselves.
What's more is that if you pay close attention to the sound cues while solving a puzzle, you will find out that the sound effects are quite helpful in reaching your objective.
Cons
Con Has some pacing issues
The first half of the game is filled with interesting creatures that you as a player encounter on the journey. While in sharp contrast, the second half of the game takes place in a deserted industrial area devoid of any lifeforms and even though puzzles become more and more interesting as you approach the end of the game, this sharp contrast between the two halves of the game creates some serious pacing issues.
The pacing issues are even more evident as you reach the ending, which while good comes quite unexpectedly.
Con Short - especially if you know what you're doing
But it never overstays it's welcome and no two situations you come across are the same or even similar, so short running time MIGHT be a pro in disguise. Also, Limbo IS almost the flawless game, so whatever playtime it had to offer, it'd hardly ever be as long as you'd probably want it to be.