Thanks for the feedback.
Crashes: The windows version is nearly not tested, so sorry for that. I will have a look at the crash at it.
Text: I couldn't think of a better way to tell the player what exactly is going on, as you might see graphics are not a strength of mine. I'll try find someone to help me.
Kind of a highscore is implemented, it's a textfile in the game folder.
The controls change some seconds after the tower appears on top of the screen. I will change this to "when passing". Thanks for the point. I first wanted to impliment a flash or something like this when controls change, but I did not have the time to do so. A sound is also a nice idea.
I plan on improving the game further, so all feedback is very appreciated!