Are there plans for either an OS X or Linux version?
Q: Will there be a version for Mac and Linux?
A: Yes, this is planned for in the near future. There is a donation campaign ongoing for this. If you would like to get SpaceEngine to Mac soon, please donate here.
not really complaining, since it runs out of the box in wine.
I absolutely refuse to expose myself on the internet to virus and other malicious digital attacks, that I do not have to be exposed to. Dropping windows entirely was one of the single best steps I took in minimizing that attack surface.
I do not have resources to dedicate to having yet another untrusted machine with expensive software for the sake of one "free" piece of software that amounts to little more than a game (even though I really like games).