"Yes, that's my usual deranged keybdindings. I'll add keybinding in the future." I was really struggling with space being hold for some reason. I have no issues swapping movement and rotations with either hand but space being hold broke my muscle memory for some reason.
The idea is really good, but I really sucked at it. Would be nice to have a zen mode with unlimited time just to practice.

Well done!

Neat idea! It's fun that straight-line clears can still be used for stack shaping, while making the connection feels like a sort of "angular" clear.

A quick note: the rotation controls are backwards from what is described in the instructions. Currently, Z performs a CW rotation (rotate right) and X performs a CCW rotation (rotate left). This may be what you meant by the comment regarding non-standard keybindings, but just wanted to make sure it was known that the instruction text describes uninverted rotation keys.