Nice work with the sand fog.
I like the sounds for the gun, and the reloading!
The bullets felt a bit off. Instead of having a projectile you could perhaps have used a trail renderer or something to visualize where the bullet flied. It was really hard to hit the enemies on the horses.
I didn't understand how the break worked, maybe it could have been a button mashing thing that was interrupted by the cowboys on horse? Could have been a fun way of having to allocate time to both shooting and mashing the break button!
Cool little game, well done!