There should be exclusive modes which they can play when purchasing lands such as a mode which can attack other base like coc and many more modes so that people willl want to buy lands. And i think energy of crabs is not necessary in a mode like this but and they can attack as long as they want. But there is a fee for searching opponents and the ratio of it when exchanging to gus should be high too like 50 new token to 1 gus. There should be a playground and toys where we can see the crabs like they are pets. And i think we should have a gacha system here which we can summon other monsters of the seas which we can use to attack other base. And we can summon random monsters depending on the class of cards that we will buy and it should be random. And different monsters should have different class too. Also it is good to introduce new crabs too and they should be expensive.