I can see the canvas but not the game!

Hi I’m making a breakout game.
There is a canvas that will show the time and a scene with bricks, ball and paddle. The game compiles now without any problems but when I hit play all I get is the canvas (I’ve yet to add a script for the UI) and the game is nowhere to be seen!

I know it might sound silly, but are you sure “Main Camera” is positioned correctly (i.e. it’s pointing to what you need it to)?