Good for first
Well it's great if you need just the basic functions of a calculator, but there is much more to the calculator than just multiplying, division, addition and subtraction. The music wasn't that great, but that is an opinion, I think you could have had a couple of choices for music, that would have been better. It was made well, so kudos on that. There wasn't really anything original about it though. Hope to see more from you later though :D
Cheers,
Nabouabo