Loved the game! Loved the visuals, the sound and the atmosphere they create. Love the voice acting, although I wish there were subtitles. For some reason it reminded me of a play station game ICO. I think, if you add some weird story to it and some exploring apart from gravity jumps, it can become an amazing game.
I got stuck for a little bit on the series of vertical jump platforms. For some reason the second platform was the most difficult for me. The last level cubes seemed unbeatable indeed. But then I decided to land on top of one of them and each time waited for two cubes to move in the same direction so the relative speed is slower to walk to the next cube. With a lot of patience I got to the other side. The rest of the level was easy. I really liked the "this is not the real end" thing on the floor and the platform that rises from below. I wish there was a final message from the voice apon reaching the end.
Great job! One of my favourite games of this jam!