Rocketbirds: Revolution! is an action platformer that resembles a modern day Flashback sequel, featuring great graphics, fluid animation, and high production values rarely seen in a Flash game. You play as Hardboiled, a veteran soldier on a mission to free the city of Albatropolis from the grip of an evil empire. The demo is basically a tutorial that teaches you how the controls work, spread over three different locations with individual rooms to pass through.

I've embedded a trailer in the extended. The full game costs US$9.95, and after purchasing it from Ratloop (of Mightier fame) via PayPal you'd only need to sign in with your user account information to play the entire thing.