Tags: Singleplayer, Steam Achievements, Multiplayer, RPG, Co-op, cooperative, Action RPG, steam-trading-cards, Sci-fi, Online Co-Op, PvP, In-App Purchases, Competitive, e-sports, Character Customization, Futuristic, Free to Play, Online multiplayer, PvE, Difficult, RTS, Tower Defense, MOBA, Early Access, Mechs