Very unique concept of building your own blocks to progress into the game, however the movement feels very difficult to control since a simple press could cause me to easily slide of the block I'm standing on, not to mention when a corner hits something, the block keeps rotating in mid-air, but I understand that as a mechanic to keep in mind. Also I do love how the circle in the middle changes color when a jump is ready, very clever.
-Try to make movement less sensitive if its going to be a precision style jumping game.
-Incorporate somekind of measurement to know how high the block can jump, but I can see that as a skill issue on my part ^^