Heya!
Quick update with some improvements and quality-of-life features :)
Features
Locking alphabet: You can now lock the alphabet at the top of the screen to keep it open when you move your mouse away.
Tracking revealed secrets: If you go back to where you found them, you'll see the secrets you've already revealed in semi-transparency (along with their hints).
Fixes
Level 45: The algorithm has been modified to be easier to solve by hand :)