I also had trouble with the input x tile move but that's a minor issue.
The main issue was puzzle at the end of the level. The angle of the puzzle is nice because it forces the player to mentally rotate the level. However I was pretty sure I did one of the puzzle correctly so I took a screenshot and retraced the tiles on the level but it still told me I was wrong. It happened twice on 2 different levels (before I gave up :o). Was it because I move a red tile on the ladder tile? I'm not sure.