CREEPER TENNIS!!!!

this is a challenge i made. when you walk into the arena and flick the switch creepers will start to fall and you have to hit them with snowballs to prevent them from falling into the arena and killing you. this is still a work in progress and any suggestions on how i could improve this are appreciated.

also the creepers spawn really fast because i don't know any ways to make a slower red stone timer so if u know how could you please help me out.

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