In principle, I liked the musical project! The snare drum and hat cymbal sound a little strange. I listened to your music and listened to small inconsistencies in the harmony, you were doing a project in D Minor Natural, and I personally expected that in the moments after B Flat Major, not A Minor would go, but A Major (Dominant), so that there was a common key of D Minor Harmonic.
I understand that you coordinated only those notes that are included in the key of D Minor, but it was possible to add Notes C and C Sharp to the series Re, Mi, Fa, Sol, La, B Flat (La Sharp), to diversify and saturate the sequence !