I like it!
Ok I like this in the fact that you are understandable and show your emotions pretty well. While the voices sound similar, I could still tell the characters apart. The important thing to remember about voice acting is the acting part, so good job there. Now since you mentioned an interest to develop new voices, just remember, slow and steady wins the race. I would recommend trying to identify your range. How low can you go? How high can you go? Then try to figure out where your voices will come from, head, throat, or chest... your normal talking is the chest. so that's a good place to start. All in all, I really like this piece and look forward to hearing more from you.