Raiden IV: Overkill vs Sky Force Anniversary
Raiden IV: Overkill
Raiden IV: Overkill is an action-based, 2D "bullet hell" shooter game with a variety of challenging game modes as players command the jets through a series of bosses and obstacles.The game brings an all-new OverKill mode in which players can complete objective specific missions while enjoying a modified scoring system. Arcade mode involves an endless shooting experience with scoring opportunities as players try to compete together on a global ranking system. Moreover, a secretive gameplay mode is also available that can only be unlocked at the end of the game. The arcade shooter brings a huge variety of customizable weapons, jets, and tougher bosses to beat.
Featuring 3D graphics in an epic fast-paced action gameplay, Raiden IV: Overkill is the vertical-scrolling shooter game that you have been searching for.
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.