The idea itself is good and I want to congratulate you with your game release! However there is barely anything to do, you could think of adding some story line with better and better npcs or something like that.
Sometimes the "Shoot" button was almost out of screen, could barely click it. Clicking on "Shoot" imho should have no delay and it should shoot immediately.
Anyway, keep it up!
Nice western design!
Nothing to do besides the shooting