u should add the explotion bullets to a separate tower. and u should make new explotino effect(the big orange ball isnt very good) and i would love a piercing tower to
when enemy gets stronger it changes colour but what if u added other colours for each spawner? and maby some turret upgrades like (piercing and Splash)
 "The Big Project Idle"){kind=icon}
 "Auto Turret"){kind=icon}
 "Ultimate Crab Battle"){kind=icon}