Very nice game with nice graphics. The sound design was a bit annoying at times but overall very good. But I got stuck in the main menu as I didnt know how to close the credits or the how-to so I had to use Alt + F4
That's because THERE IS the close button, but it's invisible (I don't know how or why). So I suppose you didn't get access to the full tutorial, but only to the first slide- oof.