Good drums and simple but powerful bass. The piano is sweet!

I'm noticing really heavy reverb here. That could be what's causing the slight muddiness in your mix. Try turning down the FX wet and hi-passing it. These frequencies tend to gradually build up and cover up whatever polish a mix may have. I'm not a huge fan of all the synths used here, so some free recommendations, ABPL bass, AGML acoustic guitar, Headroom Piano/Intimate Piano -- I don't remember where I got that last one but it was free and probably in the free kontakt library thread in the audio forum.

Other than that, nice writing. Mixing is the only thing that really needs work. I like the organic feel. Would have rated a full star higher for cleaner mix and better treatment of non-piano synths, especially percussion, which is almost hidden in the mix for most of the track.

The bass sounds a little muddy to me, but other than that this sounds pretty nice. The ambient style is relaxing for sure, and the keys are quite nice. The piano isn't terribly repetitive, but some changeups in tempo or energy would have been kind of nice. Still though, the mixing is probably my biggest gripe.

Good ambiance track, like the atmosphere ! :D