As the game is an iOS game, we should work with caution when adding elements and code to save the game from any performance overhead, glitches, or crashes. Although the engine can run a game with the Light option on an iOS device, I always prefer to stay as far away as possible from using lights/directional lights in an iOS game, as a directional light source on mealtime would mean recalculating all the vertices. So, if the level has 10k vertices with two directional lights, it will be calculated as 30k vertices.

The best way to avoid using a light source for such a simple game like the brick breaking game is to build a special material that can emulate a light emission; this material is called an emissive material.

In your project panel, right-click in an empty space (perhaps inside the materials folder) and choose a material from the Basic Assets section. Give this material a name (which, in my case, is gameEmissiveMaterial) and then double-click to open...