First major Flash project

Hey, looking for some critiques of the following:

Today is actually my last day at this job, so I won’t be able to make any changes, but I’m interested in hearing criticism. There are a couple things (the lens flare thingy and the weird cloud-meteors) that shouldn’t be there, but I was experimenting and my boss (oddly) liked them.

I’m a total amateur, so it’s probably a pretty big target. I’m mostly looking for pointers on design. I tend to have a lot of trouble making things look interesting without making them look tacky.