The game has been updated to 1.1.0. Attaching ebuild.
Created attachment 91438 [details] twindistress-1.1.0.ebuild
Ah, forgot to mention. I rewrote the warning at the end of the file about missing vorbis support in sdl-mixer. The "old way" is still there, #'ed out. I think my solution is more elegant, but feel free to change it back.
Fixed, thanks.