I love the atmosphere and art style. It has a similar ambiance and darkness to Limbo.
I just wish the keys controls were a bit smoother and better picked e.g. it's more natural to use W for jumping when left/right are A/D than pressing Space. I would also like to be able to press Shift first and then A/D to run rather than the opposite order. Would make it easier to time the character's jump precisely. Also, the checkpoint should be after the sailboat rather than before.