I was gonna make a topic about this as well, I've trying to find Shield TV APKs for weeks now but there's like only a handful of games out there I think. I've been trying to find Snake Eater for Shield but I just have no idea where. There's seems to just be very little progress or game releases for Shield Games out there.

+1 (thread resurrection?)

The official Shield TV list is incomplete, because developers themselves have to submit their games to NVIDIA and many doesen't.

I don't know if these are added yet, but there is others too which is enables extra gfx features only on Shield TV.

Snowboard World Party 1,2,3, Skateboard Party etc.
Rush Rally.
Space Marshals 2.

I bought 100% of all these games, because they are all cheap. All of them is also still updated now and then.

BTW: Official NVIDIA site is confusing, because they list streaming PC games as Shield TV games.

I started a list of Nvidia Shield compatible games with controller support here.

You should visit Nvidia Shield TV website, you will find a games section. download games from there