I'm thinking about continuing developing that prototype into a decent small game, but I’m currently facing some life difficulties , which, I believe, I will overcome soon. Anyways, I'd like also to challenge myself with few more game jams before the long, full development of any one project.
And yes, about the visual effects. it’s all about working with cameras and shaders. I used one camera to render frame of game console, another one to render a game itself (what player sees), it gives me render texture. I then used this texture in the shader which pixalates it and limits the colors. Finally, I used third camera to render UI.