Thank you so much for your feedback, I really appreciate it!
Firstly, the colors are supposed to change to prevent players from memorizing the manual. The instructions only change in that puzzle tho, but due to many complaints about that, it will be removed asap.
Now, let's talk about the font. In my opinion it is perfectly fine (but I have to agree that some characters next to each other are kinda complicated to understand, like O's and D's). Did you try decreasing the post processing effects? That would make the text a lot more readable. If so and you still couldn't read the text, I could try improving the font.
And about the difficulty... It's a very subjective topic - some people may find the game to be easy, but some people may find the game to be hard. I think I could add a simple difficulty select screen, that would definitively fix that problem! Also, you don't really need to memorize your previews attempts in the password module (that's good because I also have bad memory XD). Sure, you might get into complicated situations if you don't, but it's definitively possible. I'm sorry for all the frustration you had with it tho.
Actually. I REALLY like the idea of decrasing the time left after every error. I'm definitively going to try to add that to the game later.
Again, thank you for the feedback and for playing my game :D