This was super cool and atmospheric, I loved the little details of how floaty the dust particles were, it made the gravity feel quite believable. My biggest piece of feedback would be that it would be nice if you could rotate through all the different previews without having to hit escape to back out, it would just smooth the flow of the experience a little better. Sometimes I found the erosion unpredictable (like at first it would only change things a little bit, but then all of a sudden it was like super noisy and I didn't understand why it was such a big jump).
If you plan on developing this further, it would be super cool to actually juice up the transition and show all of the little additions and erosions growing into place. Perhaps also a terrifying ending for if you accidentally bury yourself alive :P
Overall, super different idea, I enjoyed it!