I do not have Twitter, unfortunately. :(
Some engines do not use embedded or archived images. This means that hypothetically someone who downloads/buys the game could simply take the images out of the game's folder. While this is not intended (and would be a violation of the game's license as well) it is not hard to do.
Some licenses require that assets be hidden or archived in some manner, which means that the assets simply cannot be used with engines that would leave them exposed.
Your license does not specify that assets must be hidden/archived/embedded, so I wanted to be clear if I could make a game which is not intended to distribute your images, but in which people may be able to obtain the images easier than if they were archived.
To be totally clear what I mean, this is what the file structure might look like with non-embedded assets:
game_folder/
game.exe
assets/
tilesets/
minifantasy-tileset.png
images/
sound/
And finally: The reality is I would actually like to use these assets in particular for an academic project. So I wouldn't even really be "distributing" it in the traditional sense. Rather, several people at my university would see the game and in theory could extract it's assets. (Though I would note that they should not)