[unfocussed_mike]

The worst state in Tetris is the endless stream of "zig zag" shapes, but at least with those you can alternately sacrifice and clear rows, usually.

With this, I am not convinced that the pieces are allocated in a way that remains playable. I have cleared a couple of rows (in different games!) but there just seems too much stacked against me for progress.

It could be due to my eyesight; the board area needs visual hints. It could also be due to the controls, which seem like deliberate hardship.

It is cool, but it's too difficult to be fun; there's almost no recovery possible from accidents and there are too many ways to have accidents.