I have a suggestion,there is 5 levels of how big your stake is right. Well why not take it further to encourage power ups and make each step feel not so huge like dolphin to orca, orca to whale etc.
each fish could have 3 levels or so like splinterlands and other games, like gold 1, 2, 3.
So orca is 50k, you could have 3 levels,50k,200k,350k,to feel like more of an achievement and make each jump feel less huge.
just an idea.