Issues

[Broh]

1. Preset 2 is impossible to win.
You need the crowbar to access the weapon key, but you need the weapon key to access the crowbar.

2. I have been shot by grandpa through walls multiple times.

[Buttery Stancakes]

Preset 2 is only impossible to complete if you use up all of the shotgun ammo or play on Hard difficulty with Granny only. You can use the shotgun to break the glass window, or, alternatively, shoot the planks off the wall in the shop, though that is more wasteful as far as ammo usage goes.

In such a case that the shotgun is not available, it is still "possible" to complete via an exploit, as you can drop an item behind the planks and hide, causing Granny to bump into them and break them. Also, on Normal difficulty and below, the planks don't spawn at all.

If you don't mind a quick self plug, I have fixed this bug in my G3UIP mod, which is available for download on the forums. :)

As for Grandpa shooting you through walls, is that happening near doors? Grandpa's weapon seems to be a hitscan opposed to a projectile, so my working theory is that it manages to graze you through the small crack in between doors and doorways.