VFX Update + UI Reworking

In this update, I added some VFX when reaching a score above 5 in any mode, reworked the SFX during gameplay so the enemy rabbit will now make some noise while moving instead of ominously sliding across the floor silently. 

Changelog:

-- Reworked jumping and running SFX (Weird ninja bunnies removed I guess)

-- Added a background to the game

-- Updated Cover Image to be more minimal and not as confusing

-- Re-worked UI navigation to be more mouse-focused

-- Removed Mac, Android & Linux Builds (The Linux build was bugged as I found out through testing with a VM and I cannot test with the others so for now it's just removed)