This is a prototype made in Godot Engine 4.1.1. 

If you are starting with Godot Engine 4 and are too lazy to read the 3D game tutorial on their website. I have the perfect solution for you. For just 2 dollars you will have access to my project source code made in Godot engine 4.1.1. It's a game prototype based on the first 3d tutorial that is currently on their website, with the difference I made with fish. 

Tutorial image on the Godot Engine 4.1.1 website:

My project Can be Your Project:

You can kill enemies by jumping on their back.