As the email you got didn't state words like 'reply back to this email in the next 24 hours, then I think the fact that you got an email from Apple is great news!. Maybe you have been selected as a winner and Apple Swift Student Challenge team reaching out to every prospect, I guess. I didn't get any sing email from Apple, hope I got some too.:) Anyway good luck!

check out the answer here https://stackoverflow.com/questions/67062550/is-it-ok-to-use-swiftui-in-playground-when-submitting-playground-file-for-wwdc-2/67062671?noredirect=1#comment118539363_67062671

@eskimo Thanks for the reply, could you also share details about 'zipping the app and putting it on a website'? I tried googling , but there is nearly no search results about how to do it. Thanks