Awesome game with a great concept and great puzzles! Will definitely play this again when you do any updates :D
Until I read the comments I did not understand that you meant the "End" button on the keyboard and was always searching for something in the UI ^^
And in the last level I got stuck in a wall without the possibilty to reset the level :(
(as you cannot restart when you are dead, and the rewind did not rewind anymore)