Nice work, my favourite parts are the beginning from 0:00 to 0:30 and from 3:25 until the end. The nostalgic feeling is well represented, the quality sound is great, the piano is soft and smooth to the ear. I like the rythm too.
One issue there can be is that it's a little repetitive, you add some instruments, but the structure is quite the same, which can be good, but for the middle part, 2 minutes are quite long.
Overall, it's a nice music and the piano part is what stands the most and is beautiful !