Reminds me of Into The Breach.
I played the first scenario (near Gdansk?) and managed to beat off the German attack.
It was fun figuring out the tactics. It would benefit greatly from some terrain and maybe things like mines, anti-tank etc
Sometimes I couldn't move to particular squares and I didn't know why - and the tanks appear to be only able to face in one way.
This game has lots of potential if you fix the bugs and expand it out!!