The visuals are really cool—especially the merchant and the main demon—and the atmospheric concept is very interesting, too.
In terms of gameplay, "match-3" games usually advise against using more than 3 or 4 colors (here there are 6, so combos happen less frequently), but I really liked the artifacts that change the situation on the board.
It was also great to see that the lack of combos was accounted for, with the board resetting itself.