I loved the atmosphere set by the visual style and the music, although most of it is thanks to its similarities with Inside, by Playdead. I'm not saying that's bad.
The idea is interesting, but I think it is no approached to its maximum potential, fundamentally because the only difference between the human and the lifeless shell is its speed and jump height. What if the lifeless shell doesn't collide with the environment? What if the lifeless shell can interact with certain elements?. I think this idea has a lot of potentials, and you guys should try something different, something risky.
The jumping mechanic feels weird, and because the puzzles depend so much on the jump, sometimes the game feels frustrating and unfair.
Despite the long bad comments, I liked the game, and I hope to see how it unfolds.