We've been watching AppShopper like a hawk as Apple Watch updates have been rolling out over the last day or so. MacRumors has a full list of all the interesting apps they've seen so far, but on the games front, there really hasn't been that much. …Until this morning when Rules! [$2.99] had an update approved adding Apple Watch support.
Rules! was (is) a pretty good brain game, and though I can see it playing just fine on the watch, I have no idea why you'd want to.