My sugestions:
1. There should be a sort of gladiotors arena only for PvP
2. You should be able to give other players items for free
3. You should be able to sell an item to a specific player instead of having to put it up on the market.
4. There should be animations when fighting
Picture the scene: you've killed 8 peple in deadly combat, then your assistant throws a knife into your face, but your still alive. You then muder the best gunslinger in the west, and then some executioner takes you to the gallows and kills you with no problems at all just because you added laser sight to your revolver.
I just learned something new today, I learned that the only weapon powerful enough to kill Madagascar is snezing, coughing, nausea, kindey faliure, heart faliure, brain swelling, dioreah, earthquakes, hurricanes, flooding and droughts all at the same time.
so, i am 1 pixel out of place and the level is nowhere near finished. i think your just trying to waste peoples lives by trying to get them to play the worlds hardest game