Thanks for your continued interest in the game.
I have fixed the resolution issues and Windowed Mode now should work as intended in the latest build that I have uploaded.
I like your idea of some of the non-colored tiles to mark non ladder positions when revealed and I will try to implement it with the Info Tile balancing as soon as I find the needed time.
I'm still debating in my mind if I should make the hints stay visible all the time. I made them disappear for adding some difficulty to the game so the player should use his memory skills too, but I'm not sure yet if that feature makes the game more challenging or more annoying. I will have to test it when I will add the things mentioned above to see how everything blends together.