I really like the idea behind this one and I'm curious to see how you'd develop this further. Cryptography could lead to some really cool storylines. I think there is some room for improvement on the usability side. Finding the instructions is a bit of a hassle (you can't copy-paste the link provided, but have to copy it manually and the submission file doesn't include the html file) and while the alphabet table is a striking visual element and a helpful tool, it gets hard to use when you have to scroll to the right.