Rampart[1] was always one of my favorite console games as a teenager, and strangely addictive. Perhaps that would be a fun game to port (destruction and water are key game mechanics, plays well to a voxel engine, game play is already pretty well balanced)

[1] https://en.wikipedia.org/wiki/Rampart_%28video_game%29

I got one other suggestion for Rampart from another person - definitely a possibility. I would like to take advantage of building stuff. :)

> Maybe two castles firing siege weapons at each other

Sounds like Castle Storm [1].

[1]: http://store.steampowered.com/app/241410/

Worms has been a common suggestion (as well as Scorched Earth) - definitely not a bad idea and I will likely incorporate some aspects of these games at minimum.

Sandbox games like Beseige also would be fun in this type of world.