The first RetroGuru game available for Haiku on their official site site for x86 and x86_64 Haiku flavours.
There is already a recipe to let the buildbots package it, but you have to wait a bit more for the packages.
Hermes is available as a physical CD with a comic book too, support the nice devs with some money, as they provides free download for every game for every "oldschool" and new platforms.
A new physical for Sqrxz is also in work in progress state, it would include the Haiku binaries too. Just buy it, as this would be the first commercially available game for Haiku. (The Haiku port is already ready
It could be possible, that they can include a minimal Haiku installer on the CD, or as a separate "give-away" disc, so be sure to order it as soon as possible.
Have a nice gaming hours, and try to catch that damn chicken!