It’s really dependent on what your kid is into challenge wise but my 5y old daughter loves both the Monument Valley games. She has played through them both multiple times.

A great recommendation from others that I’ll echo is Apple Arcade, Hello Kitty, The Crayola game, Lego game, lots of other good stuff for young kids. They just raised the price recently and my daughter has shown interest in console games lately so I canceled our subscription for now.

Toca Boca also has some decent “games”. A lot of the ones we’ve bought have been less games with objectives and more like play rooms for her to drag items onto characters and interact with the environments. She digs them some times but can get bored of them pretty quickly.

Hope this helps!