The black and white film look is a really strong identity, and the title screen with the gangster animals and that single splash of colour on the crosshair idea sold the tone straight away. Good call keeping the menu to four clear buttons. One suggestion: the small hint line under the menu buttons is very hard to read at the default embed size, so a slightly larger or higher contrast font would help. The LOADING state on the first button also sits there for a while on a slower connection, so a simple progress bar would reassure people that it has not frozen. Nice work for a fast arena brawler in the browser.