A strategic management game, best described as a sci-fi tower defence game with moving spaceships and configurable units. Design your own ships from a series of hulls+modular components, group the ships into a fleet, give the fleet orders and positions and then watch it engage in OTT gratuitous space battles against enemy fleets.
The only thing that didn't work perfectly was saving ship constructions with some ship types like fighter - you must've saved it repeatedly for it to work.