Nice piece it sounds very soft, calm, and atmospheric.
I think the choice of the piano VST helps with the atmospheric aspect. The sometimes audible mechanics give another layer. Also think the compression(?) that creates a buzzing sound is nice but at some times it's a bit too much for my taste. A personal pet peeve for me, which is true for many other submissions this time is the use of reverb. I feel like adding reverb (and often in addition to delay) can make anything sound good. Many times relying on the reverb is an easy way to make, especially, atmospheric pieces, sound great but when removing the reverb the composition itself can be lacking. As such using too much reverb takes away room to be creative.
With that said I did enjoy your piece and I think it works great for what it is. Even though it is improvised it still flows nicely and nothing feels particularly out of place. There might be some places where it could be a bit clearer or maybe a bit more moment in general. But, for the style (that I assume) you were going for it works great. There are other submissions that to me are in a similar category as your piece and among them, I think you managed to stand out and create a nice piece.
I enjoyed listening to it!