I like the concept and the first few levels really did a good job of showing what you can do with that mechanic. At some point the levels got pretty hard tho and the orb sometimes behaves a little unexcpected physics wise. And i think you are supposed to lose when touching spikes or the arrows but that doesnt seem to be implemented yet?
But i think its a very nice concept and it would definitly deserve some time of yours to polish it more!