It would be nice if you could have some sort of "manual hint crossing out" so that you can tell when a certain line or column of the puzzle is half-finished. I mean, if you figure out where a "4" goes but you haven't figured out where the "2" goes, you could cross out the 4 on the column's list and know what you have finished
There's a glitch where when gravity is up, the player rolls in the wrong direction to the direction it's going.
In other words, the player rolls clockwise going right when it should roll counter-clockwise