I’m 13, and this is my first app

Good point. Positive feedback for aspiring programmers is good, but also constructive advice on improvement also is needed, or, else, as you say, if naive young people get to thinking they are the next Gates or Jobs or Zuckerberg, they might skip out on really trying to learn the fundamental skills that help to create such giants. Encouragement is always good, but a sense of realism is also helpful for helping folks to improve.