Chrono.gg currently has Keep Talking And Nobody Explodes at 6.5$. It's a cool Co-op party game where one dude plays on the screen and says what he sees on a bomb and the others have to interpret it from a manual to defuse it (no screen needed).
Legends of Heroes: Trails in the Sky (First Chapter) is an incredible JRPG that I reviewed in the review thread. Second Chapter is already on steam and Third Chapter is releasing this week. So if you're a fan of the genre I suggest it.
Just don't make the mistake I did of playing the game on Hard first time through as it's meant for NG+ and you can't change difficulty once you start. Physical attacks do little (and frequently zero) damage while enemies hit bloody hard. I managed to get quite deep into the game but the battles could be exhausting.
I guess I'll unsub for stellaris, the community is rather divided on this one and I'm not good with strategy games anyway. With that being said it was like 5th time that I subbed humble monthly and holy **** it's been crazy worth it.