Well done, great graphics, sound. Gravity works fine, too. It seemed to me that the arrows are not very effective against the bats. Congratulations, Keep on making games. I identify myself with your story. I am 47 and this is my first LD, I joined a team with great talented guys and we made this one: NUKEBALL - https://ldjam.com/events/ludum-dare/38/nukeball .
If you have the opportunity, take a look at that. Most important lesson for me was that working in a team enables you go further than alone. Team work demands effort from all but it is worth it, and game jam was the perfect opportunity to try it.