I really, really tried to beat this, but just couldn't.
The controls are backwards and the fact the players Rigidbody doesn't have its rotations frozen meant I was constantly "falling over".
Also, you might want to make a Cinemachine follow camera for a game like this and zoom it out a little more. Was hard to see where I was going until I jumped.
I love the 3d pixelated art style though and what I managed to hear of the music beyond the first 20 seconds seemed good.
So good work getting this out!! Hope you keep working on you player controller a little more as I think this could be quite fun if you get those little issues fixed.