This script is only doing one thing, plots the 20 SMA and based on whether the asset's price is above or below of the SMA it changes the color of the SMA and the background's color.
Helping it to visualize whether from the 20 SMA's point of view we are in a Bull or a Bear trend. I created this because I myself use this SMA with Bitcoin on the weekly time frame to identify the macro trend on the weekly.
IMO this is a good crypto market sentiment indicator.