This game is really interesting and the gameplay mechanics themselves are good; hitting the marble around with different combos was fun. Unfortunately, hitbox issues and general jankiness (especially around slopes, I tried for 10 minutes to climb the long slope but just kept sliding back down) give much to be desired. Although if those small issues were fixed this could be a really fun game!
Also I couldn't figure out how to beat the first level until I read the combo list and realized there was an uppercut, maybe having the list show up when you start the game could help out in that regard as well.