Poor Control
The game had a great concept, and could have been amazing, but the awful control just made me get irritated with it. No matter what weapon I tried, the reticule would very slowly glide to where I moved my cursor. That's to say if it decided to move that time.
If this was done on purpose you REALLY need to find a new way to "balance" weapons, because there's no reason the starter pistol shouldn't snap right to where I point it, and all it does later on is frustrate the player.
With that minor re-working, and some nice new artwork, this could be a ten.