So, unfortunately this game doesn't seem super finished, so there's not that many specific things I can point out to be improved, since the graphics are clearly placeholders, there is no music or sfx, no kind of polish, etc.
From that little bit I've played, the character controller itself feels pretty good, and you seem to have some character swap stuff going on as well, so
Just keep working on this, I'm sure it'll be great once it's done!