That has to be a bug I didn't catch while quickly uploading the game, it was supposed to go back to the main menu indeed. Sorry for that, thanks for playing ! (edit: ah ! it goes back to main menu, but I know what I forgot, epic fail :D )
did you forget to hide the end-screen or smthg hahaha.
Liked the game as well although I don't think I won a single time as hole trying to get the player to win. Kept going in juuuust after the loss message.
Maybe it's my puzzle brain tho, but I would've gone with a predefined trajectory for the ball and the ability to rotate etc.. then the game becomes more of a fine tuning experience and it let's you make more complex courses..