This is a submission for the June Solstice Game Jam

What I Built

The Longest Day is a code-breaking game for the longest day of the year — and an ode to Alan Turing.

You play a cryptanalyst working a single solstice day, from dawn to the long midsummer midnight. Intercepted messages arrive as cold, dim letters against the dark. You decrypt them by hand — and the instant a key falls into place, the message warms from blue to gold and the whole scene fills with light. Decryption is illumination. That one idea ties the jam's themes together: light and darkness, and the passage of a single, lengthening day.

It's built around the theme on three levels at once: