What a goated entry! Love how you introduce the credits in the first levels, and the vertical levels reminded me Jump King somewhat. If this is your first game, keep it up because you are doing phenomenal!
Thanks! In 3D, you can use post-processing effects (shaders). Specifically that one is called 'Dithering'. I think there are some youtube videos about it, or, if you use godot, in godotshaders.com you can find some shaders that might interest you.
