Not sure why you've been downvoted. I feel the same way. I have no clue what this even is from the linked content.
It's obviously a video game. The real question is, what kind of game is it? And this question was not answered by the video. Plain and simple.
I won't defend the site design - it should be easier to get to https://supermariorun.com/en/about.html, but it still takes very little effort to find this.
For me, the fact that it is a game named Super Mario Run, made by Nintendo, for the iphone, instantly tells me that it will be a side scrolling runner-style game featuring Mario in Super Mario Bros style levels, with basic touch controls. In fact it occurred to me that I hadn't verified these assumptions and I just checked out the about page and found that it looks exactly like I expected.
I guess some people make the exact same assumptions I do, and this is totally not obvious to others, hence all of the miscommunication and arguing in this thread.
You got lucky in assuming what the game would be about. If you had done the same thing with other games (e.g. Pokemon Go) you would have completely missed the opportunity to discover a new kind of game.
I advise not judging things by their cover, unless you want to risk not discovering something new.