Cowboys vs Aliens

Western-style clash between intruders from outer space and locals.
It's time to saddle your horse and stuff the humanoids with lead.
Clear all the locations from the enemies and let them know that they have chosen the wrong planet.
Who will win? An extraterrestrial civilization with advanced technologies or a gang of seasoned cowboys with double-barreled shotguns and a revolver?

Control your horse with the keyboard and mouse. Aim and shoot, but be careful - not to hit your own.