Version 1.2.0:
 - added cesium-compatible icon
 - changed exit button from CLEAR to ON
 - fixed display of text in score displays

Version 1.1.0:
 - game end screen now flashes "GAME OVER" instead of just displaying it
 - displayed high score now updates when the game is restarted
 - added clear to exit to controls list in readme
 - overhauled file match, scoring, and removal behavior
 - made files fall gradually
 - reduced size of background sprite