There is no installation, just run it in a shell (xterm, gnome-terminal, konsole):
cd ~/Downloads/linux64
./Verdant\ Village
I'm not a lubuntu user, but I think you can create a desktop file on your desktop. I mean: create on your desktop a file named "VerdantVillage.desktop" with this content:
#!/usr/bin/env xdg-open
[Desktop Entry]
Name=Verdant Village
Exec='/home/ellenq/Downloads/linux64/Verdant Village'
Icon=
Type=Application
So you can click on that file and the game will run.