Gameplay wise, it's rather a simple idea but I like it. It definitely could be awesome if it would get more maps and different types of enemies plus removal of the knockback from bullets - I don't really think it's needed for this game and doesn't really serve anything.

This was fun and the projectile explosion art was great! If you add some    levels or different maps, it'll keep it fun much longer.

I'm not sure if it was intended, but shooting fast enough will cause projectiles to explode on themselves before hitting the enemy. You could change the signaling/groups in Godot to ignore friendly projectiles  in case you wanted!

I think is best to change the lifebar colour of the tank, it'll be easier to look at. Its funny how the enemy tank can destroy their own ally😂.and some of then even stuck in the wall. anyway, Its a good game!

Hey guys! I hope you will have fun!

And also: look after the bullets ;)