All too easy.
Well it's kind of a nice oldschool atmosphere to the game, but it really could use some greater challenge and complexity. There was literaly one zombie and a bat as the enemies in this game, and this was stretched out for ten levels.
The aiming system was novel, but it seemed rather like a better tactic for an artillery game or guided missile game than a sniping game. It held little urgency save hoping to get a score better than "sharp shooter", which in itself is indicative of the difficulty curve, if it's the first time I'm playing the game and I'm getting high praise in the times when I screw up, it's wonky. The only challenge was the "oh it doesn't tell me I had to shoot that one bat while it was asleep until after I've lost."
I think it's an interesting engine, but I think it's misused and needs to be more in-depth for it to really have an appeal that's worth the annoying ads pasted all over it.