I noticed that the author responds so I will pose a question.
Is there a function with the game engine to make a Linux friendly port? I am unfamiliar with the Mugen engine and know that it (or the version used) is a bit long in the tooth, so I am unsure, but many game engines have this as an option. As it stands, using applications/tools to play this game work well enough to "use" the game (I say that because it seems options and watch only work on my side. Training seems buggy).
With Microsoft making even more terrible decisions than usual lately, the kind of high end hardware requirements of Windows 11 (10th gen Intel+ and Ryzen 2000+ if I am not mistaken. TPM required and Microsoft recently patched some work arounds), cutoff date for free security updates for Windows 10 and the adaption of Linux gaining Steam (see what I did there?), I feel that having Linux ports should be more of a priority. But maybe I am just being greedy, I dunno.
Sorry for rambling.