It took way too long but out of pure spite for the dudes pathing I managed to beat it.
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Thank you, you're the first person other than a friend that's confirmed to have beaten the game.
Yes, I realized during the last days that the layout of the house wasn't particularly conducive to stealth, and even though I tried to add a few hiding spots it still ended up being a bit punishing. He can also hear you, especially when sprinting, something which I feel I could've communicated better.