Ultimately, Who's That Flying? is a spirited, enjoyable and interesting release that, while not quite managing to mine its central concept to its fullest, is nevertheless worthy of a place in your collection.
Mediatonic's experimental blend of tower defence, scrolling shooter and invincibility doesn't always gel, but approached as a survival score-attack in the vein of Canabalt, Who's That Flying?! becomes an uncommonly moreish Mini.
Who's That Flying?! is a great game. It's evident that it's from the same studio as Monsters (probably) Stole My Princess as the visuals share a similar style, the sense of humour is spot-on and the presentation is slick and way above most minis out there.