The puzzles were just challenging enough to make you think about your moves. I felt it had a good mix of levels that explained new mechanics that were "easier" and then offered levels that incorporated the mechanic that were more challenging. I think you could expand more on this even as you have a very good core game here! Please tell me Level 13 is unbeatable?! Haha! Overall had a very pleasurable playing experience!
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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.