These are available for the month of May

Marooners - Xbox One (May 1-31)
The Golf Club 2019 Featuring PGA Tour - Xbox One (May 16-June 15)
Earth Defense Force: Insect Armageddon - Xbox 360, Xbox One via backward compatibility (May 1-15)
Comic Jumper - Xbox 360, Xbox One via backward compatibility (May 16-31)

Enjoy!!!