You know, I did try having a shadow originally, but it just didn't look right. But back then I had a crappy tank model, so perhaps I should try again now.
The explosions are made of a central expanding sphere and a bunch of tiny sprites controlled by a generic particle animation system. The weaponry is modular, with one blaster that you always have, plus one of many types you can pick up. So far there's the vulcan cannon, above, and the missile, here: