In the coming updates, lighting and shaders is one of the main focuses as project Shadow, a project that is about implementing shadows into the game. This isn't easy as 3D shadows isn't really in Gdevelop.  But I can use 2D shadows which is pretty easy, but it will be a few updates before it is available to the public. But when update 0.27.8 releases, another version will be released aside that is specifically for shader testing that will be free to the public for feedback.