the creatures lvl between word passages are way to high lvled for new comers to the world
your attack damage goes down when you go to past worlds(ex. lvl50 attack at mooshu 150-220 attack at skull island 50-100)
quests should have more nautical lvl rewarded(personal opinion)
more weapons should be rewarded from quests and battles
special houses for each class
during up-date warnings show all time zones
more backpack room or bank room
don't destroy items instead ask player what item to discard to replace with the item
fix item drop rate for quest related battles(ex key and the inoshi[sorry for spelling] clan)

I know that the KI crew can fix these with a little support,on the new and best game i know

Brave Luke Silver lvl43