I got the idea of Portal.EXE while thinking of horror games, if you have ever read the Revolt or Portal.exe Creepypasta you would know what I am talking about.
The Creepypasta links are below :)
Revolt: Creepypasta.wikia.com
Portal.exe: Vizzed.com
........
You should prop make a WIP page for this...
Also read both stories before you say this is going to be a stupid mod
I will say for the notepad part do a map and wasd to move mouse then e to slect
I like .exe but not like the super really scary creppypasta
I think that, if you combine these two, you'd have something. I think what I would do is show this to a friend who had played Portal but not read any of these. That'd really freak them out. The one thing that I think would be best in this is if there weren't jumpscares. They do indeed scare people but I think to fit the theme of Portal you should leave them out. Even without this mod I always felt a chilling feeling like there was something going on that I couldn't see and it was pretty creepy. To make this mod I think it would be just ramping up that creepy-ness, not making it any less subtle, just making that creepy feeling feel more like a threat than an interest.
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It is now 2019 and I am just beginning to start more planning on the project LOL
Expected release: unknown
It is here Moddb.com