This is such a fun idea, and the use of the sideways keyboard was awesome (I felt really immersed by just that simple change).
I had a hell of a time trying to get the mechanics to work, but once I did, the hand was flying around and jumping all over the place in like a fun chaotic way, so I enjoyed that. I think having a tutorial would really increase the enjoyment factor so that players could get a better idea of how to control the hand as intended.