I'm so sad that adobe flash player is getting shut down

I mean it's pretty much one of the most vulnerable pieces of software to exist on the modern internet, I'm always amazed it was used as often and as frequently as it was given how many critical vulnerabilities it had. I would say it's past due its expiration date.

to me, it's like an eternal great depression

Don't forget that some browsers will still able to play Flash, and you can also use the web-game preservation project: https://bluemaxima.org/flashpoint/ to play Flash games locally on your computer.