Great game
It reminds me of K.O.L.M. (It's kind of like "Kind of Like Metroid" >:3 )
The atmosphere is great, and the story is interesting. The design of the game is well done, the only issue I have is the programming of the game itself. It is pretty obvious that you used hitTestPoint for the collisions and that lead to some jumpy visuals when on slanted platforms. There were a few things that bothered me with jumping (namedly that you bounce when you hold the up key and that you automatically do a double jump when you hold the up key).
If that game was more about platforming than the atmosphere this would have lowered the point count a lot more, but you still got nine out of ten, so well done!
Look into vector collision detection, metanet and tonypa have great tutorials on vector collision detection.