I normally leave reeally long reviews, but I'm a bit short on time and this piece isn't very long anyway. :p Still, I wanted to tell you that you have done a beautiful job creating this piece!
This type of music is the kind I love. Dark. Flowing. Introspective. One thing I particularly like about this loop is your use of the bass pitch that repeatedly sounds until :25. It creates an underlying feeling of stability beneath a beautifully shifting chord progression in the upper register of the piano. The interplay of multiple melody lines in the first half adds a layer of sophistication that isn't heard in many piano pieces on the audio portal. I like how all of that drops out at :25 and the texture changes to one melody. That is refreshing to hear after the conversational section from the beginning. The only thing that I don't care for is how the piece loops. It feels a little too contrived to me. Unnatural. I think it is because up until that point, the entire piece has been in a steady 4/4. All of the sudden a single bar of 2/4 sounds at the very end, breaking up the continuity. If you moved those last two notes back two beats so that they finish off the previous measure, it might flow better. It's hard to explain in writing though, and that may be nitpicking too much on my part. :p
I like the amount of reverb you use, but I think you could do more with expression. For example, the piece sounds totally quantized and rigid in tempo. No pianist would keep time that stiffly. They would slightly slow down at the end of a phrase and make the music sound more organic. Experimenting with tempo automations can make your piano music sound immensely more realistic and beautiful. It's at least something to consider.
Overall, I really dig this. While it could be tuned up a little, your loop is lush and relaxing. With some rain SFX in the background, I would love to turn off the lights in my room, close my eyes, and let my imagination wander as this music plays. It's clear that you have a gift for painting vivid pictures with your music in a very cinematic manner, and I hope you continue to develop that ability.
I'd love to hear this fleshed out to a full piece. Keep up the great work!