For the one other person out there still using their XB1 Kinect, Air Guitar Warrior is worth picking up. My six year old son loves shredding on his air guitar while sometimes riding a shark. It's pretty hilarious seeing his enthusiasm for this game.
I would describe it as the results of the Kinect and a horizontal shooter having a musically dysfunctional baby. It's silly, never serious, and it's pretty forgiving with my kid randomly throwing his arms all around. Beating a boss and getting to do a album cover pose is extremely gratifying for him and entertaining for everyone else in the room watching.