You can get free items without watching ads (like opening chests with video ads).
Call your friend to plunge into an exciting and dynamic scrolling shooter. Together you will defend the country against ruthless invaders in a campaign spanning 60 missions. Jump into endless arcade mode or take on hardcore raids with entire squadrons at your disposal! There are many enemies and powerful bosses waiting for you, but you can easily deal with them thanks to the local co-op mode.