Not Bad
No bad for your first game. Like other people have said though, lag is an issue
Try reducing the graphical quality, or cleaning up the actionscript slightly, that may speed the game up. Also, if you've used a few external AS files, you could try reducing the number of them. Or if all the code is in the actual fla file, try using some external AS files if you know how to use them. That way the game will have less code to process and will run abit quicker.
It's worth a try anyway, I'll admit my actionscripting knowledge isnt briliant, but I'm familiar with it.
mousels