Pretty good, but could use much improvement.
I guess I can start with the good:
Great music/sound
Nice visual style
That's about where it ends. The not so good:
-The targeting reticle is not indicative of where your shot lands. In most FPS games, your crosshairs change to show that the spread of your shot has increased. Something like this would greatly assist in aiming.
-'Bullet time' does more harm than good. While the visual effect is excellent, looking at it every time you fire a scoped shot gets annoying really quick. It isn't helped by the fact that the opponents all move in normal time, so they can casually duck or slide out of the way of the bullet. (I should also note that the flying bullet is shown with its casing still attached)
-Few challenges. There really isn't much variety in the game. You either shoot black silhouettes, birds, or fruit, in varying numbers. There's also very little motivation to try and replay these stages if your score was low. More missions and stages is a must.
-Only one weapon. While the detail put into it is very nice, having a single weapon is kinda weak. Especially with a game of this style. I expected to see a variety of different exotic rifles, SMGs, and pistols, only to get stuck with a pretty basic assault rifle.
It's entertaining for a short while, but with a lack of variety in challenges, and weapons, it's not really worth more than a single playthrough.