Such lovely compliments, thank you!! And thanks for seeking my game out! ♡
SPOILERS BELOW
Bruh's reply is spot-on. I'll also add one other thing because other people have commented they had a hard time with this puzzle: the diary entry (once you're able to read it) has to do with the portal code around the sliding door which is currently erased/unable to work. You'll have to replace those symbols in order to proceed.
Hope that helps!! Thanks again for playing!!