Ghostlight released a patch that restores the cut content from the Mary Skelter 2 package earlier today after all the backlash:
http://blog.ghostlight.uk.com/post/mary-skelter-2--gets-a-restoration-patch

Direct link for the patch:
https://www.dropbox.com/s/enwmtkhnuwbwou0/Mary_Skelter_2_Minigame.zip?dl=1

Installation steps for GOG users according to the link above:

1. Open GOG Galaxy, right-click on the game and under “Manage installation” select “Show folder”
2.Copy the Minigame.dat file into this folder
3. Launch the Game!

Steps for Steam users:

1. Open Steam, right-click on the game and click "Properties"
2. Click the "Local Files" tab at the top
3. Click "Browse Local Files"
4.Copy the Minigame.dat file into this folder
5. Launch the Game!

The minigame shouldn't be mandatory for completing the game, but now we can play the game as it was originally envisioned!

And it would've been better if they released it uncensored in the first place, but that's a pretty big step for the better considering Ghostlight's release history.

Little update:
It would seem the patch is just an empty .txt file renamed as Minigame.dat.
From what I read in other posts, if the download link goes down, creating an empty .txt file and renaming it yourself should work too.

Little update #2:
I just confirmed it - the patch has the same MD5 and SHA256 hashes as a generic empty file I created using the command "touch random-file-name" from Ubuntu, as well as having the same hashes of an empty txt file I just created with Sublime Text, meaning it's indeed just a generic empty file, and so the game should keep being patchable even if the download link goes down. Just make sure the file has the name "Minigame.dat", or else it'll very likely not work for patching the game.
MD5: d41d8cd98f00b204e9800998ecf8427e Minigame.dat
SHA256: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855 Minigame.dat

Happy with the news, bought my copy here and gifted one on Steam.
It's time to make items farms in the dungeons :)

Hello,

Thanks for sharing this information.
It mentions specifically that it's intended only for those in America. Does that mean it is illegal for those outside of America to download or use it?

I still have to hear/read a single mention, official or not, that the game was only allowed uncensored in the North America region, specially since the Switch version is sold digitally pretty much everywhere without issues, even in the "PAL" region (mainland Europe, UK and Australia).

I have a hunch Ghostlight either is lying (wouldn't be the first time), or they're using some very, very selective wording that somehow makes the truth unclear.

One user mentioned that: 'The patch notes that Ghostlight provided says that it should only be used while in ESRB territories,'

Most likely they have to use that as a disclaimer or else they might have to get the game rated again, or they would run into problems with the whole Australia anti-anime thing.

I just added a little note at the end of the first comment regarding the patch and if it goes down.

Added a second little update at the end of the first post confirming what I had seen in comments - that the patch is just a generic empty file.