Your controls are waaaaay too finicky. It's too easy to fly off of edges while barely pushing buttons. Also, you can get blocked into spawn by the "enemy cube", completely removing your ability to win a level. This game needs some work, good try though.
Author Comments
The Marbles Game
Created by Computer Games Programming student
K2219009 Daniel Ryszard Raczynski (DRR_Style)
of Kingston University London
Unity Assessed Workshop 1
CI5515 - Professional Game Development Environments
God danm thats tuff.