Firefly Hero was a mobile game created by Roundabyte, and it was published by Outfit7 Limited. According to the game's credits and the former Roundabyte website, the game was created by "Alex Blaj" and "Lettie E.", and was made with Inkscape and Cocos2d. The games associated with Firefly Hero were eventually taken off the App Store, and there isn't a known Android version to exist. Dwelp began development instead.
The full HD version existed but is not accessible, and older versions are inaccessible. However, an HD free version exists. The full HD version could be found here, while the regular version could be found here.
The website for Firefly Hero was located at roundabyte.com, but is no longer up.