Is it actually good? I've been tempted by the artstyle.

Well I enjoyed the little I played and the story is certainly enjoyable... :) You play as a little Princess that eventually becomes a Queen though the story! I heard Child of Light was inspired by Final Fantasy VI... The artist Yoshitaka Amano from the Final Fantasy series even created an art piece to promote it! : https://conceptartworld.com/news/child-of-light-artwork-by-yoshitaka-amano/