I liked the idea, very creative! But it was really hard, I couldn't beat the first level. I also find it confusing that one cube has multiple functions, like jumping off it and sliding on it.
Thanks for playing and for your feedback ! The difficulty seems indeed to need some smoothing, as for the multiplicity of the sound you can make with 1 cube : it's kind of the core of the gameplay, although it might indeed need some tuning in the triggering of each different sound :)