One of my favorites yet!! Really liked the art and vibes and the idea is just great, haven't seen one underground yet. The only issue for me was that my first run went on for several minutes which made me feel like I couldn't really fail and I wasn't too motivated to retry again. Otherwise, I loved it!
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The wall speeds up rapidly the lower you go, so you would definitely end up failing sooner or later. Maybe you are just really good, but personally every time I play the wall is chasing me all the time even after 3 shops in (The most optimal strategy is to stay next to the wall and mine out as many resources as possible)
Really glad that you liked it though!