Games for GNU/Linux: Deus Ex: Mankind Divided, Serious Sam Fusion 2017
Deus Ex: Mankind Divided - A Criminal Past [Steam] is a new story DLC that Feral Interactive have ported to the Linux version.
Windows gamers had it last month, so we've had a short wait to get it. Out of 165 counted reviews on Steam, the overall rating given is "Very Positive" so it looks like it could well be worth picking up.
It looks like a public beta may be available soon of Serious Fusion 2017 for Serious Sam HD.