Worked for me on macOS (Catalina 10.15.7) after moving it to th Applications folder.

Thanks for this game, it was quite enjoyable to kick some viruses !

Best 

Judith

Hi, I found a workaround for Catalina !

0) open the Terminal application

1) copy the Ressources in the expected directory with the following command :

(I assumed that the 10 Gnomes app file in your Download directory)

cp -r ~/Downloads/10\ Gnomes\ in\ Malmo.app/Contents/Resources/* ~/Library/Application\ Support/com.mateuszskutnik.10gnomesmalmo/

2) launch the game with the following command

~/Downloads/10\ Gnomes\ in\ Malmo.app/Contents/MacOS/Mac_Runner

3) enjoy !

Thank you Mateusz for this game, very welcomed in this quarantine period.

Oh yeah it works !

Thanks to you I have created a start.command file in the "submachine_universe_mac" folder with the following 3 lines script:

#!/usr/bin/env bash
BASEDIR=$(dirname "$0")
"$BASEDIR"/subnet_mac_osx.app/Contents/MacOS/Flash\ Player

if you give execution permissions :

chmod 755 start.command

Then next time you will only need to open this "start.command" file from the Finder (and won't need to use the terminal)