For app testing, I installed the CrossyRoad game from the Google Play store. The Pik TV remote D-pad doesn't function at all for this game, making it impossible to play the game. Also, the game is slightly cut-off from the screen. Checked my remote control firmware and it is up to date (2.0.19).
I also tried playing the game using the smartphone Android TV remote control app and it worked. So, Pik TV remote D-pad doesn't work but the smartphone app remote control D-pad works.
Tried some other games and had similar issues:
Of note, this issue does not impact all games. I tested the Despicable Me game and it is fully functional. I also tested a non-game app, Economist Films, and navigation via the Pik TV remote was fully functional.