Hmm.

While i understand its your first flash, i dont intend this to sound harsh but i feel you have a right to hear it as it is. Your graphics are nothing special your gameplay is basicly a more fast paced space invaders. Quite frankly its pretty lame overall i wouldnt expect it to make the front page, but there is a silver line here. i beleive if you spent alot more time polishing your graphics and making the gameplay abit more exciting it could be something to be proud of. I suggest taking what you have and improving on it, then coming back after you have spent a great deal more time making it the very best you can.

Awful Quiet in here...

I agree that sound would be a good thing to add for this game. But all in all it's not bad for your first flash game.

For your first game

It's not bad. You have the basics down, but you need to at least add some sound effects to your later projects. Something silent like this can get unentertaining after a while. Don't get discouraged, and keep going at it to get better.