A really polished and super satisfying demo, great work. I really liked the parts with the curved hills, it would be cool to see a part where you need to gain lots of momentum from the hills then do a big jump!
The soft body feels really good and the physics in general I think you could more use of the excellent physics in the level design e.g. actually needing speed or upwards momentum to get the height to get up somewhere. The buttons felt a little annoying as it wasn't difficult enough to be an actual puzzle but it was like an extra chore to do. Perhaps lean into the high speed exciting satisfying movement.
Was the game made in unity? Also how did you implement such a fluid and non glitchy soft body? I'm trying to make one for my own game.