A Linux and Mac port would be nice but is not 100% needed.
If you don't want to have proper support or bug fixing for these platforms, just make it an unstable channel!
We do plan on supporting those platforms in the near future! Once our Indiegogo campaign has finished running we're going to be getting some new hardware to let us properly support them. Ideally we should start having proper builds in a month to a month and a half from now.
Awesome! Thank you for considering Linux
If you have a strong enough windows computer you could always test the mac and linux versions in a virtual machine
That's probably what we will do for Linux. For Mac, I couldn't figure out how to buy it's OS to use as a virtual machine and, as far as I can tell, the only way to get the OS is by buying a Mac computer. Either way, it will be nice to just have the proper machines to do it all on.
It would even be nice if you just made a port for Linux and/or Mac but label it as unstable so if it is just broken sometimes it is ok because otherwise you could never play the game on Linux or Mac in the first place.