Your sister is missing. On the bright side, you have a flying dragon.

Diadra Empty is a free-roaming shoot-'em-up on a grand scale. Take the role of Nyalra and her faithful dragon Minimi in a fantastical quest to save her missing sister, and battle legions of monsters and menacing bosses. The touching storyline is complemented by the game's beautiful 2D visuals, particle effects and environments rife with enemies, and glowing projectiles. Diadra Empty gives you extreme speed and maneuverability, huge environments in which to seize the upper hand, and plenty of firepower and upgrades. You always have options, and the immensely detailed on-screen radar will help you keep track of even the off-screen chaos.
Features

Ride on top of a dragon and destroy creatures in a fantasy setting
Gorgeous 2D visuals, supports "full-screen" and 1024x768 window modes
Six open-arena free-roaming stages, plus unlockable stages
Shoot-'em-up with a unique RPG upgrade system
Highly customizable weapon system, over 72 combinations available
Steam Cards
Achievements