No editor required.

using Prowl.Runtime;
using Prowl.Vector;

new MyGame().Run("Simple Cube", 1280, 720);

public sealed class MyGame : Game
{
    public override void Initialize()
    {
        var scene = new Scene();

        // Camera
        GameObject cam = new("Main Camera");
        cam.Transform.Position = new(0, 2, -8);
        cam.AddComponent<Camera>();
        scene.Add(cam);

        // Light
        GameObject light = new("Directional Light");
        light.AddComponent<DirectionalLight>();
        light.Transform.LocalEulerAngles = new Float3(-80, 5, 0);
        scene.Add(light);

        // Cube
        GameObject cube = new("Cube");
        MeshRenderer mr = cube.AddComponent<MeshRenderer>();
        mr.Mesh = Mesh.CreateCube(Float3.One);
        mr.Material = new(Shader.LoadDefault(DefaultShader.Standard));
        scene.Add(cube);

        Scene.Load(scene);
    }
}