In [V-S] – Vertical Shooter by Jayenkai you need to destroy the bad guys as they hover about. Once destroyed, they plummet towards the ground. Try to catch these deathballs in your tail, to stop them destroying the land behind you, while at the same time, avoiding contact with them!
https://play.google.com/store/apps/details?id=com.AGameAWeek.VerticalShooter