I like the art, the gameplay was a bit repetitive with nothing to break it up. I didn't feel like I was working towards a goal in story mode. For the hard levels it was just: click the hints, reverse the hint logic, finish the level. For the easy ones the pattern was pretty clear just studying the board for a path that was similar all the way across and test. If hints were locked behind losing hearts that would have stopped me from just "cheating" when I got bored. An npc to talk to you as you lose hearts or pass a level would have made this more interesting. Overall nice job! It's a neat puzzle game with straight forward mechanics.