Reminds me of Defunct; both it and Marble Vault have IMMEDIATE replay value, because it's so easy to innovate with your second run. Difference is Marble Vault's moves seem to be semi-auto, but a lot of Defunct's are full-auto. Defunct also has an edge with how you can use your broken engine if you lose momentum, keeping you from getting frustratingly stuck on a hill you can't figure out.

The ball honestly looks like a bobber, and it would be cool if you could cast a fishing pole to SLOWLY reel the ball up challenging hills.