Well, after slaving over Game Maker for along time, I managed to finish my game, Luigi's Sky Patrol, where you play as Luigi with his new job: Sky patrol. He must clear the Mushroom Kingdom's skies from invading enemies, with Mario's help.
Here's a screenshot:

How to play:
Move Luigi's plane with the mouse, left click to shoot a bullet, and spacebar to shoot Bullet Bills. Be careful, though, you have limited Bills, though enemies drop them randomly and when you hit multiple with one bullet.
ENEMIES:
Paragoomba: Just a regular Goomba that flies, hit it with a bullet or Bullet Bill to kill it.
Paratroopa: Flying Koopa Troopa that is immune to bullets. They bounce right off! Hit it with a Bullet Bill yo defeat it.
Boo: These guys are tricky. You can't hit them, because they hide from your bullets, but they can hurt you! Just avoid them.
Bonzai Bill: The ultimate enemy, bullets bounce right off it, without even leaving a scratch! Shoot it with a Bullet Bill to 'splode it, as well as your Bill.
TIPS:
Mario comes by every once in a while and drops a mushroom. Grab it for an extra life!
Hit multiple enemies with Bullet Bills for extra points, but be careful, they stop when they hit Bonzai Bills!
Anyways, now for the game:
Attached File ( Number of downloads: 25 )
Luigi_Sky_Patrol.zip