New water slide game on front page. Wondering how it’s done

There’s a new game with water slide mechanics I think are pretty decent. Instead of it relying on having the parts the player touches speed them up down the slide, it moves the character in a set path down the slide so it can’t fail. How is this done ? I don’t need the exact code but maybe an outline of what kind of system/service is needed for this. Here’s a Dropbox link to the front page example:

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