When Facebook Instant Games rolled out in November 2016, EverWing was one of the smoothest and most feature-complete launch titles available.

A vertically-scrolling shoot-'em-up, EverWing is a game that's easy to play in short bursts but also allows the player to carry progress and upgrades across multiple sessions.

Amidst a raft of fairly rudimentary experiences and arcade ports launching alongside Facebook's HTML5-powered gaming augmentation of its Messenger app, it immediately stood out.

One reason for this is that its developer, Blackstorm Labs, was set up specifically to create - and facilitate the creation of - great experiences that don't require their own app in order to function.