I'm not going to leave a positive or negative, as I don't really have any grasp on who you are, but I instead will add some general criticisms.
Your app was really weak, because it didn't actually say anything about you at all. Helping people periodically for the past month doesn't mean you're material for staff, staff material isn't just the desire to help, but the dedication to continue to help even when you're not in the mood for it. This isn't me saying you don't have the dedication, it's just that you haven't proven it.
Also, you need to get more in depth on not only why you should be staff, but also prove you're a human being and admit your weaknesses and how you can either overcome them or ensure they won't affect your work.