I finally defeated the Eye of Cthulhu!

I finally managed to defeat that blasted eye. I know it might not seem like a big deal to most people here, but for someone who tried about five times, it feels amazing. It was a really fun fight, and I was literally down to 5 HP—I thought, "Well, that was close." But no, I actually pulled it off. Now I’d like to know what I should do next, or if there’s a special reward for killing the Eye of Cthulhu.