Thank you very much! :) (I only see your comment now, as I have been busy doing some heavy testing; I am still in a rush before the end!! Just passing by.)
I am happy as you are a fellow puzzle game creator. You’re nice saying some levels were tricky, I think level design is a half weak point of the game unfortunately, but the first (half of the?) levels are decent, I think.
I was very happy thinking of the UI display element, but… it was meant as an addition to the display on the faces, so I managed to have a great helper without the actual thing. XD I hope this does not look too weird!
As for not using pips, it was indeed totally voluntary right from the end of my heavy brainstorming. :) Although I have seen some non-puzzle games use this idea! For example, see The High Roller (Hardly Working Inc), which uses the card suits (plus 1 and 6).