Ubisoft's wonderfully presented platform-RPG effort, Child of Light, is currently free to download and keep on the publisher's digital PC store.
Released in 2014 during one of Ubisoft's more experimental periods (its beautifully moving, and equally compact, WW1 adventure Valiant Hearts arrived shortly after), Child of Heart mixes side-scrolling acrobatics with unusual RPG-esque turn-based battling, forming a frequently delightful, if somewhat insubstantial, fairy-tale-inspired diversion.
It charts the tribulations of Aurora, a young girl from 1895 Austria who wakes in the fantastical kingdom of Lemuria. The ensuing adventure is frequently gorgeous, the world rendered in delicate watercolour art and accompanied by a serene soundtrack, perfectly suited to the whole storybook ambience. About the only misstep, I'd say, are the awkward rhyming couplets used to convey the narrative, which start to grate very quickly.