Ask HN: PC Games for Young Children

I'm searching for a fun games that my 4 year old daughter could play on the PC, either mostly by herself or together with me. We had great time playing "The Gardens Between". We played it together and after we completed the game she did most of the levels again, mostly on her own.

I would say the characteristics I'm looking for are: puzzle based rather than speed/action, minimal number of keys required for control, no violence. Hopefully nice graphics too.