Light on cube problem Android

I’m making a 2D game and I have this cube spinning there, kind of to brake the 2D feeling and give something different. The problem I’m having is that the game is for mobile, Android, and, as you know, light is a problem on mobile devices.
In the Editor my purple cube with a Spotlight looks pretty, but when running on my mobile device looks like it has no light lighting the cube. It is flat purple and seems like isnt a cube, because you cant see the corners and different faces.
What can I do?

how many lights do you have? select important option in light property in the inspector. You can display your unity editor scene and the mobile scene that can help better.