A quick bug report: On Linux, I got an in-game error when the file "D_o_ceño.png" was trying to be read. After looking at the game files, that file appears to have been renamed at some point to "D_o_ce�o.png (invalid encoding)", and the tarball (.tar.bz2) file itself appears to contain a file named "D_o_ce�o.png". I was able to rename the decompressed file to the correct name just fine on my end, so the issue may have been with the "ñ" character being unsupported either by the tarball (the .tar.bz2 file) or by some filesystem that was used before the file was compressed.
If the issue can't itself be directly fixed, renaming the file to something that doesn't use the "ñ" character should keep others from having the same issue as a workaround.