@LukeAlmighty That's the complete game, and I still won't take it.
As for demos, they're dead, for the most part.
There are different types of demos, but most are gone due to psychological reasons.
When people play a demo, they want to sample the experience.
Too short, and it's frustrating, you feel like you wasted your time playing it.
Too long, and the odds of people buying the game is reduced dramatically, as they feel like they've played your game before.
And they will also experience frustration as they replay the section of the game they saw in the demo.
A successful demo is not too long that you won't mind replaying the same segment of the game when you come across it, while also ending with a cliff-hanger to entice people to actually buy it, and not feel like it's already checked off their list.
So a demo is only really useful for games with a proper plot, and a certain play session time.
It's a very small bullseye to hit, while also costing money and allocating development time that can go to day-1 patches or additional content (expansions / DLC).
That's why most companies just release a trailer, and a few screenshots.