Fun game! I like the mechanics! Great work so far. If you want to make it a complete game, I would think how to make it uniquely different from Backpack Battles.
When I right click on items, it does bring up the right click menu for me which is annoying. I also think some items aren't working or I'm not understanding them correctly. The when no armor items didn't seem to work for me or the heals based on a percentage of health.