Demo Patch #1 - Balance & bug fixes

*Increased the “DEATH TO SLIMES” kill count to 7 and wave recharge down to 3. *Made the click collider slightly bigger. *Made all waves from 7 and up slightly easier. *Slightly increased the size of the small fast slimes. Also slightly decreased the speed. *Slightly lowered the speed of all slime bullets. Also decreased how often they shoot. *Decreased the starting click cooldown time down from 0.81 sec to 0.75. Also made the click cooldown upgrade better. Bug fix: The wrong background was set when first playing the game. Bug fix: The challenge hover icon had a chance to mess up and constantly play sound effects.