Could've been so much more
This game could have been so much more but was ruined by poor execution and implementation. The main problems are: (1) bland interface, (2) boring gameplay, (3) extremely poor music.
The engine actually really good. I like how the turrets of the tanks revolved realistically and the machine guns and main gun were both implemented very well. The tanks were well detailed (except that I don't think they painted Tigers as orange and black, lmao). However, the really impressive vehicles could have been used in a game that had better gameplay. A defense game is not suitable for realistic vehicles, because it's stupid to see that a Tiger being unable to blow up a wooden box within two shots.
Also, would've been cool if there were more heavier tanks, like the IS-2, Panther, Tiger II, Jadgpanther, etc. I think you too might have realized that vehicles weren't very suitable for defense games and cut back on heavy tanks...