Quite nice...
The levels were pretty nicely made, the music upped the mood a little, but i still haven't found anything to seperate this from every other "first flash game".
Next time, take some time in polishing up some of the artwork, or adding extensions as upgrades, power-ups, enemies or other stuff to keep the player playing, and add some variation to the game. I know how tempting it is to upload a flash after working very hard on it, but be honest with yourself and try to look at the game from the average viewers' perspective, and see for yourself wether it's worth uploading or not.
I hope this helped a little.