This is the base of a tiny proof of concept for recreating the platforms from The Floor Is Jelly in Unity. The project only includes the source of the plaform generation and sprining.
The rendering is done using Shapes by Freya Holmér and available on the Unity Asset Store. Simply add Shapes to the project and the Polygon component to the JellyPlatform game object.
You can create your own platforms by creating a CornerShape object and defining the corners.