Try Aurora - Dwarf Fortress in Space!
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It is tiny, either its a well compressed download or something else. I have watched the lets plays and the world map is better designed graphically than CK1, and that alone is over 500MB on my HD installed. Doubt really if that's a good estimation, unless, as I say, its heavily compressed. Could be wrong.
You really have no idea how huge graphics are and thus game with little graphics and generated landscape can be so little...
There's no video. The graphics are largely 2D TGA files. The map is not state-of-the-art graphics, which means it does not require a lot of pre-calculated textures to display at playable speed.
The heart of this game is a bunch of text files listing characters, their titles, relationships to achother etc. And there is nothing on this earth that is easier to compress then a text file.
500mb for the download but 2Go as requirement to install
For example, Skyrim; my current installation folder is a shade over 5.5 GB. About 4 GB of that is Meshes.bsa, Textures.bsa and Voices.bsa. Skyrim.esm and TESV.exe, which are the core program and most of the actual "game" (quest definitions, item stats and so forth) are less than 300 MB put together.
“It's now very common to hear people say, 'I'm rather offended by that.' As if that gives them certain rights. It's actually nothing more... than a whine. 'I find that offensive.' It has no meaning; it has no purpose; it has no reason to be respected as a phrase. 'I am offended by that.' Well, so what.” - Stephen Fry.