Omg so fun.The enemy ai was very simple yet very well made.The UI was suiting as well.I loved trying out new strats like maxing out my strength to kill enemies or maxing out my speed to become flash and save every goal. Things I would do:
1) Make ball slower at start and keep increasing speed until a goal is scored and that will reset the speed.
2)Instead of bouncing the ball off the player give a little knockback a whiteflash and stop the ball for that time.This will act as a grace period after taking damage.