A Classical waltz, very cool! Most waltzes I have listened to have been in the Romantic style. This piece gets very interesting after the 1 minute mark. Your harmony is much more interesting here, kudos! And I love the part at 1:40, right before the waltz goes back to root key. The only thing I will say that when you compose music, try varying your harmonies a little more. For example, when we look at your first page, there are no accidentals. This tells us that we are in strict key! And sometimes this is fine, especially if you are trying to write a folk tune, or something simple. But this piece would greatly benefit from a little more harmonic variation.
If you have not watched my Valentine's Day video yet, be sure you do! I talk about the role of harmony in Romantic music. You may enjoy it, and learn a few things along the way.