Update notes v2.2.1

[list] [*] New “Difficulty” menu that allows the player to switch between game modes at any time! [*] Optimized overall game performance! [*] Improved image quality of some cutscenes and level backgrounds [*] Rebalanced “Haunted Grapefish” speed and timers in "Sprint of Spirits" level [*] Fixed leaderboard time display rounding differently from level time display [*] Fixed a bug where the in-game time trial display would not show anymore when the player would press ESC from inside Options screen until the player restart the level [/list]