Thin...
The melody is too pseudo-baroque/early classical. It needs more variance in the modes and the chord progressions you use , as well as the orchestration. The melody is mostly in upper registers and mid-range, and the counter-point in the bass isn't strong enough to support it. Also, check the chord at 0:30. Moving block chords aren't usually a good idea unless they are spread out in the bass parts (10ths with tonic as bass work real nice!).