I highly recommend Humongous Entertainment games. They have so many good games to choose from, it's hard to pick a bad one. As a kid I was especially fond of Freddie Fish and Pajama Sam. They have since put a lot of them on Steam if you want to go that route as well.
I introduced my kid to Putt Putt quite a while ago via ScummVM. She played all of the main games multiple times, she really loved them. I also showed her Freddie Fish, but she didn't care about it.