Competent
Hardly an original concept. Executed well enough. I found the music cutting out or skipping a bit though, the white 3/4 border around the game was annoying (using firefox 3) and scrolling to the side by moving the mouse to the edge of the screen was a bad decision I think, since it made it tricky to shoot things which are at the sides of the screen. It also wasn't sufficiently explained that this was possible.
Lastly, not being able to shoot through foliage was a little annoying.
Overall an average game. Not bad, but nothing special.