Not very challenging at all...
I liked the way the menu looked, but I didn't even bother with the story and I just took off because, needless to say, I'm pretty good at Lunar Lander. The music got monotonous after the second level, and I was further annoyed when I discovered that all I could do was just turn it off or on. But regardless, the replay value falls short. Not only was it an easy game to begin with, this one was even easier because you didn't have to worry about the angle of the craft or anything, just as long as you made it from point "A" to point "B" intact you've passed the level because the craft self-rights itself, leaving you to just watch out for the rocks above you, below you, and on the last couple of ones, beside you.
All in all, annoying music, alright graphics, no replay value, not challenging...
...You have potential, it's just this game wasn't very fun.
Phobos Technology, Phobotech.