I tried adding two games to Guix while listening to people argue about
some things on a conference call today.  I ran into problems with both
of these though!

 - jumpnbump has just a makefile and nothing else, and I don't know enough
   to fix up the path stuff.
 - eunuchs-orbital-sniper is hitting some weird issues while compiling
   and I'm not sure if they're path things or what.

Maybe someone else will want to finish these, I think I'm not
motivated/skilled enough to follow through myself!