Haven't played this version update yet but -
Mystery Box lv100 reward is a GREAT change, and while I can understand to an extent putting a cap on how much you're able to farm that, this is definitely going to impact player retention.
Maybe rework the reward system to where it's incremental instead? Such as... every 5 levels, Nemo Bucks. Every 10 levels, Egg Coin.
I think it can be reworked to reflect more along the pass progression scaling. Putting a cap on it seems arbitrary and detrimental.