Good lander
There are thousands of landers made in flash but yours is among the best ones.
There is a background, you have missions to fulfill, the graphics are above the average, good sounds, good maniability.
For me, the main problem was that it seems to ba impossible to finish the level 2. Also, the highscores didn't seem to work.
You could also have added some small animations when you finish a level, or when you crash too.
And last thing, I think you should call it Mars Lander instead of Lunar because, as far as I know, it's Mars that is red, and not the Moon ;-)
Looking forward for your next game.