LOL

Need sound.
Improve the graphics.

mmm...

you got a good concept of animation but you could improve your graphics.

LOL

I realy like it.. you need to improve the graphics but it was good.

Good...

Congratulations if this is really your first flash. :D
You can improve:
-Don't keep the space ship stoped in the same place, make it move forward perhaps..
-Improve the graphics in general and give a better atmosphere.
-Try o make different enemy space ships with different power than normal ones.
-There are too many space ships at the same time.

good work