The PoC release of Lonely. It is in a Z-Code 8 format (.z8) and you'll need a Z Machine interpreter such as my favorite, Gargoyle.
Please note that in the full releases, there will be the separate DMG, EXE, DEB, etc. files.
Gargoyle Download - Ccxvii.net
Gargoyle supports Windows, Mac, and Linux. If you're on Ubuntu it is downloadable from the Ubuntu Software Center.