Airships

Achievements
A real-time strategy game where you design airships and then fight with them. At its core, the game is about designing airships and fighting with them. Ships are put together out of modules, and the layout of modules matters a great deal: everything on board is done by individual airsailors who need to run around, ferrying coal, ammunition, water and repair tools - and sometimes their fallen comrades.
summary by MetaCritic