I see that it mentions a Universal version of the game for MacOS but it also says that it was last updated in 2018 and Steam lists it as a game that doesn't work under Catalina or later versions of MacOS. I got this from a Humble Bundle years ago but never actually played it, was considering buying it if it has an updated version that would work with Big Sur but it isn't clear if it does (and if so it should be updated in Steam as well)

There is an untested Catalina+Later version I've uploaded here for folks who want to see if it works (I believe there was at least one person who confirmed it was working). I haven't pushed it to Steam yet (partly b/c I haven't had a chance to test it properly on a Catalina machine and also partly because the computer I push Steam builds from broke and I haven't fixed that yet either, haha)