I love the little turnaround you do at 0:27 and 1:07.
One of the thing you can easily improve is the instruments choice, to my ears, they are too similar, everything is soft and silky, the bass, keys and melody (also keys?) sounds muchy in the end. The melody should probably be an octave higher to not clash with the chords.
Also when you have such a standard and repetitive chord progression you should search for a more sophisticated bass line.
If your piece is not more fancy than this its also hard to not add drums.