Minor polishing

Made it default choice for new players that they need to start their own music, let's see if this improves the game engagement. Made the "play music" icon and text a bit larger to make sure people can see it. Also made the infinite lives default choice for new players as it's not as punishing, maybe player's that struggle with the game keep playing more now.

Fine tuned the difficulty curve of the game. Levels 5 and 6 felt a bit too difficult as they were.

Also now the game instructs better on the game controls if player go to options menu. It's now context sensitive, so when playing with controller it shows controller instructions.