Hrm, itch had a hiccup and deleted the old files for the game. If you're using the itch app, you might have to remove it and re-add it to get it to work.
I deleted everything including the patreon only files I had and still getting the error.
I would just try to download from the site itself instead of the app, it appears to work just fine for my end.
I've found you can download an old version and then just get the updated .jar file and that works
There been a error when ever I play on mobile the game randomly close out when eve I'm in a fight do you know how to fix it