Thanks a lot for your feedback.
So, the level you rage quite at was btw. the last one, and there was a reason why I put it in the end; sorry about that one :). So all you really missed is the "Thanks for playing" screen.
The CTRL key is never introduced in the game. It plays into the "You're out of CTRL" joke, so you'll never use that key. That was actually a last minute pun I put into the game :)
With the difficulty curve it was a bit tricky. I kinda reordered the levels in the end, based on how hard I thought they are. As the creator of the levels, that's not that easy to tell though. In the end everything was all over the place; I just made sure that the annoying one is in the end.