To install on GameShell (OS v0.2), ssh to it and issue:
curl -sL https://github.com/pleft/hydracastlelabyrinth/releases/download/v1.0.0-GS.1/hydracastlelabyrinth.tar.gz | tar -xvz --directory "/home/cpi/apps/Menu/21_Indie Games"
Then reload the UI and navigate to Indie Games folder to find the shortcut for HCL