Early Access Patch 0.1.15

[h3]First boss and UI upgrades ːsteamhappyː [/h3] [list] [*] Added purple world boss (Stage 11) [*] Added footstep sounds [*] Fixed pause state of the game when pausing [*] Upgrade some player sprites and animations [*] Upgrade some menu UI aspects [*] Upgrade some dialog UI aspects [/list]