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Bounty Battle is a fighting game taking characters from many other popular indie games like Darkest Dungeon, Awesomenauts, Guacamelee (and many more). It's crowdfunding on Fig and I have to say I'm pretty excited about it.
Neil deGrasse Tyson Presents: Space Odyssey was announced late last year and the initial website that was setup listed Linux support. The Kickstarter has now launched and it doesn't mention Linux now, neither did their press email to me.
The Underground King was one of the last games submitted to Steam Greenlight before being quickly Greenlit by Valve. The promising mix of racing strategy and RPG mechanics is currently on Kickstarter, complete with Linux support.
Ash of Gods is a mix of tactical combat RPG and visual novel being developed by Russian studio Aurum Dust and currently on Kickstarter. It uses Unity and should release on Win/Mac/Linux simultaneously at the end of 2017.