Interesting idea! Was a cool twist that your life is actually that of the merchants.
Nice graphics and sound fitting to the game look.
Some changes I'd add. Having the shoot on hold mouse down so I don't have to click repeatedly.
And maybe a bit of balancing. Would of been cool to play a bit longer. Maybe have the wall I put up broken down by the monsters. Bit of and endless game. :)
Feel like there's promise here! Could turn into something quite cool.