My godot framework help you to create your own 2D plateformer game without coding anything on Godot engine. READ THE DOC !
Simple Doom clone I made in this tutorial: https://www.youtube.com/watch?v=LbyyjmOji0M
Simple platformer made in this tutorial: https://www.youtube.com/watch?v=NScngW8vxK8
Simple top down shooter made in this tutorial: https://www.youtube.com/watch?v=5vYI_mgERBU