Absolute visual masterpiece. If you enjoy beautiful colourful visuals like this but also like a bit more action in your platformer, give the Ori games a go.
Definitely absolutely play The Last Campfire, its like being read a bedtime story in the absolute best way.
Others already mentioned Journey, Abzu and Flower, but if you enjoy Journey do give Sky: Children of the Light a go. Same devs, similar design philosophy, but with a heightened focus on meeting players and creating memories.