First of, your track has very nice 'warm and soothing' feel to it. Quite relaxing, to be honest. I think it would work fine for a menu or something, though not as much in-game. It's slightly too monotonous for that.
Which is also basically my first point of criticism. There's quite a bit of variety, yet nothing 'spectacular' seems to happen. After listening to it a couple of times, it became mildly boring. Perhaps if you made it longer and added a few new things, it'd be much better.
In terms of mastering, the only thing that sounds a bit off are the drums. The hi-hat and snare drum could be a bit 'softer' to blend more with the rest of the piece. Other than that, you did well!
Not a lot more I can say about it. All in all, I quite like it, though there are a few things that you could work on to make it even better. All in all, 4/5 & 7/10.
Yeah, monotony is probably one of the most persistent flaws in my music.
Definitely appreciate the review, I'll have to keep it in mind. Thanks!