Atomic Super Boss is a little but nerve-wrecking bullet hell game. You fight an endless boss who will use his many attacks to try and blow you up. Obviously, it has instant deaths, 3 difficulty modes, and online highscores.

Controls:

arrow keys move
z fires
firing slows you down, and the closer you are, the more bullets hit the boss.

Online highscores can be found here:
http://billybobscore.freehostia.com/shmupscores.php
http://billybobscore.freehostia.com/shmupscoreshard.php

Have fun!