Fun concept. The gunslinger theme in a workspace reminds me of the paintball episode from Community, which is awesome.
Game could have benefitted from some background music, and (personally) I would've slightly increased the movement speed of all characters to make it feel a bit more fluid, but that's just my preference. Also the dodging felt like it should have followed the keyboard and not the mouse.
Still, fun game overall. I could see it going on a store page if polished.