Unity
I appreciate your response and the fact you have made what looks like a really interesting game, but I always end up puzzled by the fact relatively few developers are willing to make Linux builds, even though most if not all popular engines allow for an easy export, like Unity for example: https://docs.unity3d.com/Manual/linux.html
Hope you might reconsider your stance for this and possibly your future projects as well.
It may be that creating a Linux build is non-complex. The real problem is all of the other work involved in management, deployment, and support of the build. The same goes for Mac. Adding all of the dimensions to getting new builds out there and fully supported, it's just a bit too much to tackle for our tiny team.
That being said, I was a full-time Linux user myself in a past life, so I'll always consider Mac and Linux builds in any project. Hopefully I can make it happen on the next one.
I understand the overhead is not something any dev looks forward to, but I've also seen teams of one successfuly supporting their games on multiple platforms. As they say, where there's a will, there's a way.
Another point to keep in mind is that we, the Linux users, are still mostly being treated as second-class citizens at best (which is not to be confused with normalizing such behavior), so any form of support is surely better than none.
Too bad to hear you switching sides though. If you still have the knack for it, maybe check out the current state, a lot has changed over the past few years.