Masks tells a charming, fairy tale-like story of a magpie who encounters various woodland creatures (all with alliterative names - Margaret the mouse, Owen the owl...) who have some problem or another. The story is linear, with branching via binary choices: to help, or not? As befits a fairy tale, of course, the morals are simple - ignore people in need at your own peril, with potentially terrible consequences; as befits a fairy tale, too, the 'right' action is equally simple.
Most of the story text is integrated into the illustrations, while choices are in text-only screens, which struck me a being a bit jarring. It would have been lovely if the layout was more responsive: removing the sidebar, for instance, or allowing resizing.
Nonetheless, Masks is worth clicking through if you're looking for a fairy tale told straight, with pastel-hued illustrations.