Fixed a bug that prevented enemy spawn rates from properly increasing
Adjusted upgrade values to scale proportionally (tradeoff and damage)
Bomb special visuals improved
Frostbite cursor base duration reduced from 2.0 to 1.5.
Ying and yang base damage was reduced from 0.25 to 0.1.
Kunai knockback nerfed by 25%.
Earthquake and purge size reduced to not expand beyond the screen so much.