Did you try the instructions in the included rtf file for Linux? This usually seems to fix it for most Linux users:
Run 'chmod +x ./nw' and then './nw' instead of './Game'.
Oof, not sure then. All I can really suggest is re-downloading the game, or maybe playing the browser version: https://www.newgrounds.com/portal/view/732699
Let me know if you get it working!