I can't remember this game and I'm trying my hardest.
So it's a game about tanks which shoot each other, I think you had turns and had to aim the angle. I don't know how many people could play, but a minimum of at least two people and you could also play against AI.
The game was 2D, and it had a nice gradient background and the scenery under the tanks was a nice, green field from what I remember. The catch was that when you aimed at the ground and the tank projectile hit it, it would destroy a radius, like a circle, and the remaining ground that was in the air would fall down like spikes, I guess, but it looked like a phonogram if you get what I'm saying. The OST was also pretty cool from what I remember.