Good and bad.
Well animated, good weapon, nice graphics.
But, there are no health packs, you have no powerups, and the enemy force is overwhelming.
You might want to put a mute button for both the music and the special effects. That way you can turn off the music and play your own but still hear the gun fire.
A pause button would be incredibly helpful.
If you could make this multiplayer, this game would be incredible.