Good framework
For your first ever submission this is pretty impressive from an AS standpoint.
This is a good base to work from, but you'll need to make a few improvements.
First of all get some higher quality music, search for a decent loop here on NG or even OCremix.org. Nemesistheory and paragonx9 here do some pretty good loops.
The white dots need to appear from both directions, and also diagonally, like the green ones do. Just copy whatever code you did to make the green ones appear. Otherwise the game quickly becomes predictable.
Artwork, a simple textured background, replace the dots with some graphics/characters and make them a bit bigger, also when moving diagonally you move much faster the just pure left and right because you're adding the speed to both the .x and .y at the same time. Look into using pythagoras' theorem to fix that.
Other than that it's got a lot of promise, couple more weeks making it prettier and more stable and you'll have yourself a well-received addition to NG!