Thank you for the feedback and kind words!
Level 13 should be beatable (20 levels in the game), but I havn't tested the game on all devices so there could be some hidden bug of course.
SPOILER ALERT
To beat the level, first make the block fall to the exit rotate back to the first orientation. Then make the block fall towards you but quickly rotate back. That should slow down the block enough to fall into the hole.