Technically you use space and esc on the menu but this is being kinda unfair. I love the challenge even if I can only get 20 seconds into the song. It took me a sec to find when I was supposed to press the mouse. Maybe you could add an arrow for where to press or a short tutorial for a few notes? I like the simplistic graphical style. Though I thought the idea was quite a lot like Guitar Hero but harder. All and all I like the game though.