Best 2D platformer in the world as far as I'm concerned. The gameplay and controls are extremely fluid, the levels are beautiful and well-designed (so well, in fact, that anytime you think you've found an unintended mechanic, think again, because it's probably intended), the story is great, and the music is amazing.

There's something in this game which I refer to as "flow". Every level has its own flow. The game requires a lot of good timing and cycles, but all you really need to do is submerge yourself in the flow of the level and you won't have to worry about timing at all. It's extremely satisfying.

Do note that the game is also extremely difficult. It starts out fairly easy, but each level introduces additional mechanics. By the end, you'll have to use techniques which are generally reserved only for speedruns (because they are quite difficult to pull off). This also results in the game having an extremely satisfying progression. You don't really level up, in that sense—you don't unlock more abilities as the game goes on, for example. Everything is available to you from the very beginning. It's just that each level gradually requires the use of more and more of these abilities, until the end of the game, where you have to use your entire arsenal if you hope to make it.

Best 2D platformer in the world as far as I'm concerned. The gameplay and controls are extremely fluid, the levels are beautiful and well-designed (so well, in fact, that anytime you think you've found an unintended mechanic, think again, because it's probably intended), the story is great, and the music is amazing. There's something in this game which I refer to as "flow". Every level has its own flow. The game requires a lot of good timing and cycles, but all you really need to do is submerge yourself in the flow of the level and you won't have to worry about timing at all. It's extremely satisfying. Do note that the game is also extremely difficult. It starts out fairly easy, but each level introduces additional mechanics. By the end, you'll have to use techniques which are generally reserved only for speedruns (because they are quite difficult to pull off). This also results in the game having an extremely satisfying progression. You don't really level up, in that sense—you don't unlock more abilities as the game goes on, for example. Everything is available to you from the very beginning. It's just that each level gradually requires the use of more and more of these abilities, until the end of the game, where you have to use your entire arsenal if you hope to make it.