I got one of these when I backed them on Kickstarter. It was a fun build and works well. I gave it to one of my neighbors' kids since I didn't really see myself using it all that much, and he enjoys it.
He can also code some simple commands to move servos just with the mobile app: https://docs.petoi.com/mobile-app/controller#customized-comm...
He can even make a Petoi robot sing some melodies: https://docs.petoi.com/applications/melody-creation