I also got the game with the Bundle for Racial Justice and Equality, and I'm afraid the Linux build is incomplete: as the file name suggests it only contains the RadishLinuxBuilt_Data directory, and it lacks the RadishLinuxBuilt.x86 binary to launch the game.
I could get it to work with the binary of another Unity game built with the same runtime (version 5.6.5f1), but still I think you should re-upload a complete Linux build. Thanks!