Mastering is pretty fine.
But the 3 chord repetition at the beginning at the beat is pretty dull. I would get impatient with that. So vary that up a bit.
Also, when the beat does come in, at 0:38 when in reverts a chord down, i don't think that's a good chord to use. The F# makes is feel kind of awkward. But if you move some notes around in that chord you can make it sound better. It's good so far.

Nice beat could use some lyrics. But still I like it, keep making cool beats man!