Warstone TD is an interesting Tower Defense game that includes the additional strategy of a town with lots of unlocks. It also has co-op maps, and multiplayer PvP maps! Grab a friend!
Dead Exit is a strategy based card game in which you manage survivors and resources. Fight the zombie hordes, alone, against or with other players.
An in depth look at Hex: Shards of Fate, an MtG-inspired collectible card game. I've played this for hundreds of hours and I'm glad to say it's finally shaping up.