I think the game has a fun concept, but i had one concern about the gameplay. Once the countdown reaches 0, the CPU draws its weapon, but you can still keep holding the space bar and shoot whenever you want. Because of that, there isn't really a sense of failure or "game over". The only penalty is that your timer ends up being higher than the CPU's.
I think it would be more engaging if the duel actually ended when the CPU shot first, or if there were some kind of failure state for reacting too late (or too early). That would make the tension of the countdown feel much stronger.
