Absolutely love the concept - like you have an island, but you MUST appease crabs, give them flower crowns and they'll go away! Otherwise they'll eat your island haha, just excellent and very wholesome worldbuilding.
Sadly, the middle scroll button being both the 'scroll in / out' and 'crown crabs' is a bit wonky - might be better to have flowercrown be Left clicking on the crab? Or spacebar perhaps. Also the command for placing land seemed to have a delay before it would actually happen - not sure if that was intentional, but it made the game feel a tad stilted with the land action when scrolling and flower-crowning was always instant.
It also might be fun to have the option to click and drag to pick up a crab and set it further away. That would only delay the inevitable of course - you'd still get mobbed as you frantically try and toss them away, but also in certain instances would allow a few more flowers to grow. Sort of risk vs reward? Just a musing thought though
Nonetheless, a fun game I enjoyed appeasing the crabs hehe. C: