Thank you so much for the linux version.
I'd like to tell you that extracting the files stripped the execute bits so the shell treats the launcher and engine as plain data files. To fix it, extract the game to a folder (my folder is ~/My Games/OTC) & run:
cd "$HOME/My Games/OTC" 2>&1
chmod +x OfftheClock data/ags64 data/ags32 2>&1
./OfftheClock 2>&1