Blast Works: Build, Trade, Destroy
Blast Works: Build, Trade, Destroy is a side-scrolling shooter that will let you customize and build levels, ships, and enemy ships.
If you're into games like Gradius and Project S-11, and happen to possess twitch reflexes, Phalanx has your call sign, Ace.
Star Soldier R
An intergalactic top-down 3D shooter and features score uploads allowing you to compete against fighter pilots around the world.