I'm not a developer or anything so I don't know what is or isn't cheap - but how about the option of making ships so you can cross oceans?
Or, in the tutorial screen when it suggests where you make your first settlement, it stops letting you do that on a literal island with no other settlements xD
Or, in the tutorial screen when it suggests where you make your first settlement, it stops letting you do that on a literal island with no other settlements xD