A somewhat niche game. A must have for those, who love spaceships, and often create their own desings:
Admirals of Ophiuchus
Design your Ships. Build your Fleet. Destroy your enemies in complex battle simulations!
A fast paced, easy to learn, strategic game. Offers great fun, when played against friends, but also features single player:
Battleships Combat: Evolved
A classical Battleships game, but with a twist! More interesting ships and attack patterns will bring you far more fun and excitement!