Hey, there... I guess I messed up a little. But thanks for checking it out and telling me that it doesn't work. I reuploaded the game and it seems to be working. Tested it with keyboard and gamepad (xBox old gamepad).
The "any key" is here at the startscreen y,z, and x (keyboard) or gamepad A, X. But the rest of the game I used c, v (keyboard, gamepad is the same)...
I put in the control sceme in the game description, getting stuck on the title screen is I assume not the best introduction to the game, sorry for that...