Whenever I see another youtuber making a platform game (Whether 2d or 3d), I always go "WHYYY? There are so many out there and it's so hard to make it actually good", but yours caught my attention particularly well!
The character is cute, the animations are really well polished, and the mechanics work flawlessly.
As some feedback, I feel like the character is a bit floaty as the animation is faster than his actual movement, and when you turn it also feels like he's sliding a bit. I always refer back to Super Mario Oddysey but the character really feels grounded in that game, and I think you can learn a lot from how they handled the animation / turning.
One last pain point is that it would be nice to also have a system in place where if you run for long enough your character picks up speed. I know the actual levels will be more compact than the test level but with the amount of open space here, traversing from one end of the level to the other can be a bit boring.
Otherwise, I think you're off to a really good start here with the game. Can't wait to see where it goes!