Great game! The ingame music is wonderful too! Could I please get the name of it? I find only the ending music title (Evening Glow from Tadashii Kamen no Tsukaikata OST) in the comments.
About fullscreen mode: I accept that, this is not an option on Kongregate, but the cinematic mode neither. In my monitor it is just the same.
But I have an idea, which can help to solve the "plus" 50x50 puzzles: Show the helping numbers not only on the left and up side of the grid, but in the right and down side as well. Because to solve the lower right corner is really hard if I cant see the clues.