MY four previous comments were talking about/to Acexander0's comments which were removed due to the tremendous size, that's why they don't seem to make sense with the two comments not posted by me.

Nice game. I think the controls for the dragon that starts off on the right side of the screen, should be the ones that are on the right side of the keyboard, so the red dragon should move with the arrow keys and the blue dragon should move with W A S D. Is it intentional that a dragon can shoot himself, because why would somebody/something shoot itself?

put the turn(90) in the constructor and the balls come out sideways instead of up and also u shud put a counter in for how often the balls come out