That's a good start, but it lacks a few things, in my opinion (and I insist, it's just my opinion).
- First, more important changes would be nice. It's the main "problem" that I have, it's quite repetitive.
The idea of having a loop of 4 or 8 bars and adding a layer at the beginning of everyloop is too predictable and so a bit "boring" at some point, for the listener. Your theme is not bad, but it's repeated too much. Same about the chord progression.
- I could hear the percussive sounds a bit in the middle, and the rest on the right, nothing on the left. The stereo is really important, and (to me) especially when it comes to percussions. Having the "kick" in the right ear all the time and nothing to balance it on the left ear was not really pleasant, to be honest.
- A wider variety of instruments would have been good. I think piano and organ on the same range, when there's not that much else, is a bit too much.
As said, it's not bad, but a bit more work on the balance (stereo, volume) and on theme changes would have been good.
Don't give up, though! We all learn everyday :D