First Flash? Pretty Good!
For your first flash this is Awesome! I can see where you tried some more complex stuff, and I think it some places, it worked (ex. Smoke from X's capsule). The sound effects were also done well (but make sure to watch your sound levels!). I really want to see more from you, so heres a list of stuff to look out for next time.
Animation means being ALIVE:
In several places, all your characters just stand still and blink (the talking parts). Remember that changing shots, or animating character gestures will help deliver the dialouge better as well as keep the viewer intrested. This is even more important when there is alot of dialouge (like in your moive).
Speed it up:
Some of the animations (alot of the fighting) was a little slow paced. I'm assuming because this was your first flash, you didn't play around with ajusting the framerate. Try making little flash movies to test beam movement and getting a good feel for timing in animation. Don't be afraid to turn the framerate up to 18 or even 24 fps.
Reading??! READING!??!! WHAT DO YOU THINK THIS IS? THE INTERNET?!:
At the beginning, put a spot to skip through the text. Some people read faster than others, and waiting for the text can be boring.
Keep up the Good Work!