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