Love the concept of being an arms dealer, and the dialogue was pretty funny. The limited stock at the arms dealer added some challenge, as I would have to try and memorise what weapon somebody wanted if it wasn't in stock at the time. It starts to drag towards the end however, and I found myself skipping the merchant gamble because I would have to pay double half the time, so I might as well skip it.
To improve, I would either make the game shorter, or make the gameplay more dynamic and exciting, and also change the random merchant dice game to be more skill-based (even like blackjack, which is still largely down to chance)