Another small update which addresses more feedback I've received. 

Patch Notes:

-Added the ability to move the camera around freely by pressing the S key (or the Y/Triangle button). This can also be activated from the pause menu

-Added music to the main menu

-Adjusted World 1's music more

-There's now signs in Level 1-1 and 1-2 which give tips

-The popup text box in Level 1-2 has been removed, as it's no longer needed