The game looks really polished. Colors, text choice, and overall composition (including the different letter combinations) is done well. It really pushed me to understanding the game more. Last levels were super hard, but still passable once you get the hang of it. With story elements on the side, this could be a really nice papers please - like game. :) A small thing, starting the letter with "lorem ipsum dolor sit amet" kind of broke the magic that it was a somewhat real cipher for me :D.