A video game is an electronic game that involves interaction with a user interface to generate visual feedback on a two- or three-dimensional video display device such as a TV screen, virtual reality headset or computer monitor.
i think they mean like what's the dev trying to tell us. like Undertale is about the importance of choice, and the game sally face is very much a game about humanity and how people react to tragedy. sometimes these things are up for interpretation and sometimes they are very clear like the game that dragon cancer and about the battles of having a loved one go through cancer. the commenter is asking what the message was.