This is the skeleton of a game. A potentially interesting one, but very unfinished. I don't even think tanks have an attack animation? Or maybe they don't attack? Enemy tanks sure do seem to do it, where can I look up this information? What stats am I upgrading? By how much? There was another very similar game here, I don't recall its name, but it had all these features. Plus a prestige and a bit of strategy with different unit types and building them. I think if you want to make a similar game, looking at that one might give you a good idea as to how to do it.