https://store.steampowered.com/app/855850/Space_Elite_Force/
https://store.steampowered.com/app/1204470/Space_Elite_Force_II/
https://store.steampowered.com/app/1086160/Space_War_Infinity/
https://store.steampowered.com/app/1036490/Space_Smash/
Steam Summer Sale!
Source: Steam Community (opens in a new tab)