As mentioned above, Yes, you can still play Flash Games after 2020. Not online that, You can play it Offline using the Official Adobe Flash Player.
How to Download Flash Games?
Visual Method For SWF Player for Games
If you are still confused a little then Consider watching the video below for a clear and detailed explanation.
Download Adobe Flash Player After 2020 (Swf Player for Games)
Then click “Open”, and then “Okay”