Hi, Em! This was a great melancholic piece and I enjoyed listening to it!
It seems to me you start the piece in A major and end it in D major, but I wouldn't worry too much about it. You tend to "color" your major triads (at least the tonic and subdominant) as maj7 chords, so this piece never seems to have a home key—it sort of walks in the neighborhood of A/D major and their relative minors. I like it when songs have this ambiguity!
The repetition didn't bother me, as I don't think you were going for a strictly classical feel. To me, it sounded like a pop/classical hybrid—maybe even something from a movie—so the repeated phrases seemed to belong. I will mention a troubling bar or two from the score, if that's ok. In m48-49 you have the RH playing a sustained F# while the LH is supposed to hit that same note a few times, too. This, of course, won't be playable, so that passage may need to be adjusted.
I think you definitely have talent as a composer! Your musical form will become more structured the more you compose. Keep up the good work!