Task: Make a very fast-paced iOS game with responsive controls and gameplay usability.
In Chopper Defense HD, you defend your island from increasingly aggressive enemy attacks while evading their homing missiles. The game gets intense very quickly and the main challenge was to make very usable controls and design the game environment in such a way that would provide players with ample visual and audial cues to maximize their awareness of immediate battle situation.
Starting in relative tranquility and escalating chaos to insanity, Chopper Defense HD will quickly push you to the edge of your ability. Armed with a machine gun and a blast cannon, your chopper will be wiping out hordes of enemy formations and evading their relentless homing missiles.
Excerpt from iTunes game description
I've built this game alone from scratch, including designing gameplay, coding it, creating graphics, editing sounds, etc. Cocos2D-iphone framework helped a lot.

Normal level of enemy activity. The chopper's cockpit is red which means one health point left.