We did it bois, though that last level is more luck than skill xd, still fun though. How many sharks do you need to unlock the final mermaid? And does the new mermaids have any skills, like the yellow one getting goldfish for eating sharks?
Yep the purple hair has better stockpiling, and the brown hair has double ability duration :)
You unlock the top mermaid by eating 100 sharks total, and the bottom by beating all the shark hunt levels
Try swimming up while her warning is showing, then swimming down when it disappears. That's what I do, along with using the abilities the best you can