The destruction with the different parts breaking off is really cool, you've got a great start to the vehicle combat already. I think if you added fantasy tank designs like in for example Panzer Front, you could have something pretty unique, especially if the two factions have their own distinct design philosophy and playstyles.
I have to say it's a bit difficult to tell what sort of damage I'm doing at times, maybe you could have your tank's gunner/commander say what you hit in a subtitle or down in the conrer, like "Engine hit, sir!". Also the mouse sensitivity was real fast, seems the mechanics keep the turret rings well-greased.
Either way, very solid so far, looking forward to seeing what comes of this!