For resolution clarification, you need the game to be 160x144, but you can scale it so that it runs in a window large enough for people to see. In past jams most people scale x2 or x4. A lot of people usually even include options in the settings to allow for scaling preference.
I think he is asking if you can put a background around the game that isn't the game, like the graphics that surround Cat Astro Phi.