If you can stand a few suggestions, here are a couple that are intended to help with future recordings-- there's no need to change this one, and these aren't criticisms.
Rather than have just one instrument (in this case, acoustic piano) playing for an extended period with accompaniment, how about switching the main part off to a different instrument or two after a bit (in this case, a mellow sax followed by an acoustic guitar might be nice), as well as letting the accompanying instruments have a bit of front time for a bit.
By the way, I liked that the percussion wasn't a typical drum rhythm, but was a snare played with a brush-- it really went well with the bass and piano.
This was, I take it, unscripted free-form jazz, so it's understandable that there are no specific themes or keys. But it would be interesting if you varied the mood a bit by using one dominant key or recurring theme in one part, then switched to different dominant keys or recurring themes in other parts.