Someone appears to had found it, maybe it's the full version or demo?
From The Lost Media Wiki
A while ago on the doomworld forums someone by the name of Tetzlaff found this game, but it's unclear if it's the demo or full version.
Here's a link: https://web.archive.org/web/20030827141208/http://www.lasthalfofdarkness.com:80/ghostblood/download.htm