I’ve commented many times regarding this problem: Among Us would crash in iPhone 5,5s, and 5. In case you didn’t know already, iPhone 5c, 5s, 5, and below—Among Us will not work well. Is suggest if you have an iPhone 6 (or up) download Among Us there and it can work. Have a good day.
(If you have an iPhone 5 that can work with Among Us you’re very lucky, y’know...)