As far as I know, it DOES work on joiplay, although I never tried it out myself. Maybe you are having problems because the game needs the RTP as well?
Viewing post in Caliross, The Shapeshifter's Legacy comments
it's saying the game isn't compatible. I have all the plugins. It won't even let me add the game to joiplay period. I think it may have something to do with the way the files are. When a game is one single thing it never works for me. I think it had something to do with an update. I tried an older version but I still couldn't get it to work. So I'm not sure
I see. Sadly I don't know much about how joiplay works, and I am unsure what's wrong with it. If you have an account on F95zone, you might try asking in the thread, I know some people got the game to work before.
https://f95zone.to/threads/caliross-the-shapeshifters-legacy-v0-9991a-mdqp.1530/