Well with that half empty/half desolate town, bone yard where crime was done nearby and quest to save trader against bandits who pursue him, you might be right.
A Fistfull of Dollars is about a lone gunman pitting two town bosses against each other. I don't really see any connection with Fisfull of Dollars except that its in the West, theres a cemetary (every town has one), and theres a gunfight. The town isn't even set up like an Old Western town.
Now, I can totally see a connection with The Magnifacent Seven. Mysterious stranger (you) decides to save town from bandits (Gangers) for no pay with 6 other fighters with different talents (Pete, Sunny, Trudy, Victor, Cheyenne, Ringo) to help. Theres also a direct reference (perhaps unintentional) to the film if you choose to be pessimistic with Sunny about the chance that they're going to die.