Noiz2sa has .ogg files for its sound. It tries to load the sounds on startup, but when it fails to do so it just disables the sound. The game is still playable, just that the user might want sound support. If sdl-mixer is compiled with the vorbis USE flag, Noiz2sa can play the sound. My suggestion is tell the user that if they want sound, they should compile sdl-mixer with USE=vorbis.
Created attachment 82610 [details, diff] patch file for ebuild I have attached a patch file for the ebuild to tell users about the sound issue after the package as been installed.
Fixed in CVS... Thanks for the patch!