It's been so long since a platformer has gotten me as excited as this game has; I usually leave the review for the second and third paragraph, but before reading on and if you're able to, play this game. Right now. (If you can't, want to read the review first, or just want to watch someone else do it, that's totally fine too)
Regular platforming movement aside, this game's gimmick is that you're able to release your "soul" in order to propel yourself in the direction that it ends facing in; the soul (which is released facing upwards upon use) can be turned left and right, and either once it reaches a certain distance from the player or if the player uses the soul button again after release, they are sent with both the momentum and angle of direction of the soul. At face value, this sounds like a more difficult to control version of double jumping and dashing, but the amount of freedom you get from choosing where and how hard you get through in certain angles makes this game feel extremely liberating. While the base game is easy enough to where you don't have to focus on micromanaging your momentum and shot angle, the 5 bonus levels make extreme use of these concepts, making even a slight angle difference cost you half a level's worth of progress. Add onto this some amazing music and pleasing visuals, and you have yourself a masterful game that will test your patience and skill.
There weren't any glitches that I could find on my two playthroughs of the game, but I will say this: the bonus stages are difficult. Really difficult. This game doesn't hold your hand in teaching how your soul can be sent vertically on release, nor about the minute angle differences. Every jump and level is possible (there are even stages that can be done a few different ways), so keep trying and experiment with aiming your soul. By far the hardest level was Bonus Stage 4, if you're curious :)
All in all, this game needs an official full release. It's a beautiful love letter to the platformer genre, and I can't wait to hopefully see it receive a massive update!
My Playthrough: