Everwing vs Sky Force Anniversary
Everwing
Everwing is a fun arcade game that may bring to mind one of the best classic game ever, Alien Invaders. However, instead of shooting at aliens, you'll be playing as a fairy (out of the seven available), who sets off to fight against the many monsters, both normal ones and bosses, that have somehow popped up in the world with her faithful sidekicks. There are also boss raids which will require you to work cooperatively with other players or your friends to get some amazing loot.What puts Everwing apart from all the other mobile games on either Google Play or the AppStore is that this game is not available on either platforms. Instead, you can get the game for free via Facebook Messenger.
Sky Force Anniversary
Sky Force Anniversary brings Sky Force to platforms other than Android and iOS, namely PC and consoles, allowing even more players to enjoy its exhilarating arcade shooting action. It is basically similar to Sky Force 2014 on mobile and features everything you'd expect to find in the latter, including challenging enemies and bosses, large number of missions, weekly PvP tourneys, an in-depth airplane upgrade system along with a wide variety of planes to fly as and weapons to blast enemies into smithereens. In this version, you can also play the game cooperatively with a friend through the game's local multiplayer option.Oddly enough, despite its similarities to Sky Force 2014, Sky Force Anniversary is available on Android as well. Unfortunately, I'm pretty sure the game doesn't support cross-platform cooperative gameplay so you can't exactly play with your friend cooperatively if he is on the PC and you on your phone.
Sky Force Anniversary is the best (and only) version of Sky Force that you can get for Nintendo Wii, PlayStation (3, 4 and Vita), and Xbox Live, but if you want to play the game on your mobile, you can get either the Anniversary version (Android only) or the 2014 version.