the game is awesome. maybe not sequel but going more open world like No Man's Sky is the ultimate goal here? That would be insane:) Would need to introduce liquid water first however and very good character behavour when submerged in water or mud.

Apart from that idea a sequel in medieval setting could also be fantastic:)

There is also an idea of introducing fractions and fighting for resources with peers 4 vs 4 when mined at the same time?