In response to "How Can We Improve?"
Perhaps for user research, you could speak to more users of various dating apps to learn about their pain points and sticky points(what they like about certain apps) and their dating app experiences!! Similarly, for the beta test, the more user testing, the better the app will be! For the assumption that dating apps expose people to rejection and in turn might cause depression and anxiety, I am not sure if the research on the casual link is sound. Also, even if the assumption is true, users might face repeated rejection in your app idea so the issue is not solved entirely. perhaps instead of an app, other ideas can be explored that gives them opportunities to interact with others and have shared positive experiences - eg event planning/games/etc