It’s so simple that you might now quite get it, there is a first screen, like a splash screen, then the main play screen appears. You could add code to include a help screen, etc. Or not.
In this case a splash screen appears for 3 seconds, total time, then another screen appears that has a molecule and fonts on it. This represents a very simple way to have a splash screen with your game, but it only works with one screen.
If you are a little more advanced, you can see that it would be easy to create a class to handle some of the code in this program, it is not my goal to create class heavy programs that are difficult to understand. I removed all “using” lines that were not being used, good practice would just keep them in as the compiler removes any that are not in use.
Make sure to scroll down to get to the zip file with the code ready to run!