In Overlay Gamerlay-stable is only older version games-arcade/gianasreturn-1.0 http://www.gianas-return.de/ This need to download http://www.gianas-return.de/gr-v10-ubuntu.zip But there is only http://www.gianas-return.de/gr-v1001-ubuntu.zip Please add this Version to Overalay Gamerlay stable, here is ebuild which works.
Created attachment 266991 [details] gianasreturn-1.001.ebuild which works
There is explicitly stated in the gamerlay that noone should open bugs for it in gentoo bugzilla. Drop by on irc at freenode.net network channel #gamerlay and report it there. Cheers