I really like the idea of creating new threats to protect yourself from the current one! It's a cool concept but I felt like it lacked some balance in its execution:
The positive sign goes too fast, it's really hard to trick him to fall on the ball when you start the game, it often feels more like luck than planification. The negative sign felt better in that regard.
I think the difficulty curve of the game could work better with enemies that are easier to counter but get summoned in bigger numbers.