It’s Harvard, so I would imagine more than a handful of students interested in CS have created apps and are submitting them with their applications. That means that you will be competing with the best of the best in CS. Only you know if your apps are up to the challenge of competing with the likes of these HS students: https://www.lifehack.org/articles/money/wanna-millionaire-learn-from-these-12-kids-who-already-are.html