The antithesis to Huntercoin's gameplay is perhaps a game that does require (and allow) player input only at time of character creation.
This would be a programmable alife predator-prey simulation.

Once the (totally stupid, hence almost no memory or cpu footprint) critters are sent into battle, players can only watch. (but don't have to, in case of players with jobs)

It could run alongside Huntercoin, no player input also means almost no UI programming (not my thing)
A challenge is to make it so that no "hunter" is necessary to play (i.e. to communicate with the Huntercoin blockchain without a hunter)