What is a lightweight game engine?

Question

Programming

I have a niece who is a student. I want to occupy his leisure time with something interesting and useful at the same time.
For CryEngine, his computer is rather weak. So you need something simple and at the same time not antediluvian. Easy to learn, to take the first steps in programming and game development. What can you advise? Maybe there is something web-oriented?
I'll drink him a csm-ku for this, let him indulge and show his friends.
So far I have found and advised:

1. https://playcanvas.com - it's embarrassing that you can't take the code for free. And the niece will not be able to pay $ 15 a month
   
2. https://unity3d.com/ru/ - the requirement for hardware is confusing, you can’t call it lightweight
   
3. https://scratch.mit.edu/ - confuses the lack of prospects
   

It turned out that the nephew already has unity, downloaded it to run games, so we’ll try to start on it. Thanks to everyone who was not on the sidelines.

Answer 1

Have a look at Godot:
https://godotengine.org/
It has a simple interface and a simple Python-like scripting language.

Answer 2

I would suggest all sorts of cool libraries for webGL like babylon or threejs. Development of three-dimensional graphics in canvas.
https://threejs.org/
babylonjs.com
UPD If we talk about the graphical interface, then threejs has a plus - an add-on for manipulating elements on the scene.
https://github.com/dataarts/dat.gui

Answer 3

https://www.scirra.com/construct2 to start with visual programming, and then you can write code.

Answer 4

I'll add Blend4Web to the proposed list . For your purposes, the functionality is completely free, there are a lot of ready-made examples in the distro, designed exclusively for the web, but most importantly - a complete symbiosis with Blender. In addition to programming, the tribe will be able to learn how to model in a professional program.