Interesting way to subvert expectations with this one. I really liked the art style, but I'd suggest making the uncovered squares a different color than the covered ones, because the board can be confusing to look at sometimes.
Also, is there supposed to be an ending if you win? I tried a couple of times but the game stops working after I solve the board. I had to lose on purpose to see how the game ties in the "cult" part of the theme.