Ohhh I think I encountered that bug as well. It was when I was trying to move a tile but one of the itch website labels was overlapping with it. At the moment, this can be resolved by playing the game in full screen but yeah, ideally it wouldn’t happen at all.
I already have in mind to add a few optional hints to the game, and a pop up if you fill all the slots but have the wrong solution (currently it does nothing, so you could sit there unsure for a while). There’s an ending screen that only happens if you get the solution right!
Thank you for your feedback and for playing :)