What does “as long as the final submission has the ability to be launched from a separated application” mean?

I believe it means that if you can run it from a file directly instead of from in the game engine. 

That would be for example, exporting to a .exe file that just runs on its own. I think it's fine if it needs other files to run, as long as it is run from an executable file directly instead of from inside a game engine.

oh ok thanks :3