creating my first game

Im finally creating my first video game. my grandpas favorite videogame was always space invaders. when he was young he used to go play it in the arcade, so i decided to learn gdscript and how to use the godot game engine so i can create a 3D space invaders for him. its in its early stages ive only been working on it for 4 days so not everything is perfect yet and i dont have 3D models or textures just yet.