For late game it would be very nice to have something like a second life you can buy. So if you die you can instead spend your white cubes and continue. This would be really useful because when playing on easy for example for the first half hour+ I dont have to upgrade anything so I´m doing something else and might forget to check in time. Would make it more convenient.
 "The Perfect Tower"){kind=icon}
 "Accelerator"){kind=icon}