So I did the tutorial, and then tried to advance to the next level and got the end screen no matter what. Alt+f4'ing and then trying to just select the level and advance the text locks you in this screen no matter what with The Rook
So, I couldn't quite play your game past the tutorial! Still, it looks super cute, the music is great, and the Tutorial works! I'd put an indicater on the square you're moving to (crosshair, white highlight etc.) which would help with the isometric nature of the game.