ok.
So, I put gfx, mix, scripts and settings forders in /usr/share/games/freera/data directory
When I launch the game in the menu. Nothing appends.
So, I went to /usr/share/games/freera/
and made : ./freera but that doesn't work
vfs /filesystem/externalvfs.cpp line 81: open file ./freera.log
Binpath = .
ERROR: Unable to find mixes for any of the supported games!

I haven't any freera.log file created :s