[iBreez]

Add that system from iEra where the crabs pop out randomly while your digging.
Then make a "Crab Token" shop where if you give 1 shell of each color crab to the NPC, it gives you back a Crab Token.
Crab Tokens could be spent on sea related stuff, such as a Crab Claw equip wep that acts like the hunter's knife, water gun that's like a teravolt and shoots out water, but does noticably lesser damage than a teravolt.

On a side note, GOOD Weapons need to have lower prices.
I say that all the expensive weapons with low freeze in shops should have their shop price lowered by a reasonable amount, so that they're worth around 10k-20k, and people can afford them.
I'm a good sparrer, but I cannot sacrifice my life to mine for 400 hours just so I can have a good enough mining level to make money ez.