Kickstarter supporter here. Also hoping for a native Linux game. I'm currently downloading the Windows version on GOG, since someone posted video of it being playable on Linux with WINE, but native is always best. (Honestly, using Vulkan API is really the only good video choice for game development, since it covers all kinds of operating systems.) I haven't used Windows at home in many years, and I've stopped crowdfunding Windows games too. I've started requiring at least a promise of a native port at some point. I trust that you'll get around to it eventually.
