Good. Just a few suggestions.
1.) Make the interface easier to read. I know making things circular is neat, but it's much harder to interpret out of the corner of your eye. Just make straight gauges; they're easier to keep track of. Also, make sure the health guage is the most prominent, then the shield gauge, then the special attack gauge. If you want to make sure the player doesn't forget to use a special attack, then make the gauge dark when not full, and have it flash rapidly when it finishes so it catches the player's eye. Also, let the player use items with the 1, 2, and 3 keys as well as the mouse.
2.) Create specific spawn points for enemies. Create visible doors into the arena, so the player knows where the enemies might come from, and where to stay away from. Nothing's more frustrating when a new enemy suddenly spawns right behind you.
3.) There are a few glitches with the music. It sometimes neglects to start up when the gameplay begins. Also, the movement of the enemies is a bit shifty. They often move a step to the left or right, but not evasively, more "slight rendering problem"-y.
Other than that, nice game, and here's to a good score.