im pretty sure there's already a rhythm game that does this, can't remember the name now. i like to think undertale caused it to be popular due to that one attack in undyne's fight.
the soul's design reminds me of..something else, and the difficulty needs some tweaking. overall, functional rhythm game, but i think you should try a different approach
adding more to this actually, this doesn't really "work" as a rhythm game in the sense you press to the beat. i tried doing that, but the charting doesn't really follow the notes and instead the song acts more as background music for the game itself, which is also just meh. so it's more of an arcade game than a rhythm game, it just says it's a rhythm game. people like to call geometry dash for example a rhythm game because levels often sync to the beat. games like osu and etterna always go to the beat or song in their charting, this funny lil soul here doesn't really follow on-beat, if that makes more sense