Released on 2018-12-11. Old ebuild seems to work. ...though it looks like upstream decided to bundle a soundfont of their choice...
https://manual.dengine.net/version/2.1.1 "Version 2.1.1 Patch release for 2.1 that improves the stability of the engine and fixes some incorrect behavior. There were a couple of regressions in the renderer such as white flashes with additively blended dynamic lights, and black walls appearing in the sky. A few bugs have also been fixed in the game menus and resource file management. "
Bumped in commit e6bc6b47ba7d22ecda0c8e4cc7b54070a6f751ba, so this is obsolete.