Awesome. I downloaded right after you uploaded but didn't get to playing it for a few days. That's why I didn't have the second level.
If you get stuck on the physics, let me know. I've done enough Unity that I could work up a quick example.
Viewing post in Mad Marbles jam comments
I would love to take a look at it. I work until Sunday evening (I run a kids coding school) and then I'm on a little trip with my daughter. Mid-next week I'll have some time to connect with you on this.
Meanwhile, here's an example in Scratch: https://scratch.mit.edu/projects/794315773/
You can click see inside. The code is block-based, but basically works like pseudocode. Looking into Unity a bit, in your update loop, you'd want to multiply the RigidBody.Velocity by that 0.95 or whatever.