Copter.io

Destroy  as much enemy helicopters / tanks / drones / buildings as you can to level up
Upgrade your skills to overcome your enemies
Evolve your ship as a sniper, multiple-canons, fast-shooter, grenadier, ...
Hack your victory with one of the many special abilities: grenade, bullet wipe, teleport, airstrike, banana bomb, laser beam....
Dominate your opponents to become the king of the arena