PSP-Hacks.com

Description:
theb1rdm4n's appropriately titled homebrew game, Birdman's Shooter.

It is loosely based off of the game Galaga. The game pits you against endless waves of enemies that get harder as the game goes on. Every 8 levels there is a bonus level and the enemies get harder, but the enemy count resets back to level one and continues to grow every level. If you perfect a bonus level you get an extra life and bonus points. Scores grow exponentially as the current level and difficulty increase. Scores are also slightly based off of your accuracy, so the more accurate you are, the higher your score will be.