Later edit: do the tutorial people. It explains how left click is for shooting blacks and right click is for shooting whites. Game plays much better once you know the rules :)
Original review:
Brilliant graphics, pretty nice music and smooth controls. The weapon shooting is satisfying and impacts are pretty juicy.
Not sure about the ammo "regenerating" over time. It pulls me out of the action and I just end up running around waiting for it to refill. I would have preferred some kind of infinite ammo to allow me a more aggressive play-style.
I found a bug in the web build. If I press R (which I was doing instinctively to try and reload the weapons) the game crashes.