Thank you for posting this!
2019 source code release
For the first time in over five years, I've uploaded the source code for Eldritch. It's available here: https://www.eldritchgame.com/bin/Eldritch-Source-2019-04-16.zip
This replaces FMOD with the open source SoLoud audio engine, and supports the current Steam version (minus Steam libs, and redacted to avoid cheevo/leaderboard hacking). As with the original source release, this is mostly intended for educational purposes; it's not readily moddable. It is released under the permissive zlib license, which allows for any use except claiming authorship or resharing this source without including the notice: eldritchgame.com/bin/license.txt
(As with the 2014 release, this includes a minimal amount of content: just the config files, shaders, and rooms. You still have to own a purchased copy of Eldritch to play the game.)