I made a small gameplay trailer as shown here:
https://s3-us-west-2.amazonaws.com/secure.notion-static.com/3ba1a980-8ca2-4087-aaa3-6f7475b0381b/Chernobly_Trailer.mp4
This was my first edit so it definitly isn't perfect but it was good enough.
It also showed a short story we had that would show how the player got into this situation, so you wouldn't be randomly thrown into the game.

If you would escape you would get the win screen and a really bad (on purpose) fanfare:

https://s3-us-west-2.amazonaws.com/secure.notion-static.com/aa1c4b86-761f-4127-8eb7-20bbb962079a/BadFanfare.mp3
Yet if the player would take 6 minutes and still not win (which would be surprising as the game is not that long), you would die and explode:

https://s3-us-west-2.amazonaws.com/secure.notion-static.com/ad804f29-1584-4414-abd4-c08ba0070233/Nuclear_explosion.mp3