Something to work with here.
First let me say I love the ability to challenge people on the leaderboard, even though it is not truly multiplayer it adds a sense of community to the game. the graphics are nice but not great.
There are times in the game where the wait period between READY and DRAW is far to long, I understand wanting to get a good sense of reaction time but I really don't like staring at the word ready for 10 seconds, it takes me out of the game and feels like I am waiting for a slow web page to load which is very frustrating. I think the ready and draw would greatly benefit from an overhaul to make them far more obvious (the red blends in) A nice graphic with a clean stroke on the outside would look alot nicer and be less tiring on the eyes.
The game needs a little more to it in the single-player mode, like a series of ever faster gunmen to battle, perhaps an upgrade or two (a way to do more damage and a way to take less damage).
The game is a good start and could be alot better.