It is amazing that you put together something this solid in your first game jam! In under two hours, even? With sound? Great job! Yes, the sound isn't amazing, but you took the time to make it. Yes, the graphics aren't the best they could be, but you took the time and effort to do it! And you programmed it up and had the courage to release it, so you should be proud of yourself.
What did you learn this jam? Did you gain any experience that will help you in the future?
I hope you had a good time and will continue to develop and release games!