I'm getting stuck right into Besiege, which I'm sure you've all heard of, but for those who haven't here's a little video:
It's a fantastic game that took me a little while to grasp fully, but the basics aren't hard to learn. Definitely a good time sink!
Another great game I've been playing is The Showdown Effect, which is a 2D multiplayer brawler/shooter where the playable characters are based off of movie action heroes. I originally bought it because I was hyped for the release of Smash 4 and wanted something to fill the void, but I never got around to playing it until recently. Unfortunately the community seems kinda dead, but it's been fun playing with a few friends.
Anyways, have you guys been playing anything worthwhile?