Prestige feature?
I would like to see a feature called “prestige”, where players can sacrifice their progress to get a bonus. I’d suggest making prestige give a currency that grants +1% diamond production per unit, and players should also be able to spend that currency on permanent upgrades. The formula for prestige currency gained upon prestiging should be (all time diamonds/1 billion)^0.5 - prestige currency gained from previous prestiges (whether spent or not), rounded down to the integer.