I've posted quite a few times to edu-sig about Codesters, an in-browser JavaScript platform (based on Skulpt) that runs a reduced Python, but with added features. Cool learning environment!
I've just uploaded another teaching Youtube, with a very live-demo flavor i.e. the goal changes slightly as new strategies get adopted. However, there's measurable progress, as measured by me, the talking head.
https://youtu.be/0GYLToWnhI4Season Changer in Codesters ( < 8 mins)
My eventual project, which I'm hoping the whole class will engage in (not each working solo, but as a team), puts you in an 8x8 "chessboard" where the arrow keys take you from square to square, and each square is a background image.
That's a simple framework. You may then imagine simple games such as Buried Treasure based on this simple infrastructure. A matrix of hexagon-pentagons on a sphere? That would be for another classroom and platform. :-D
Codesters does implement the Turtle with penup, pendown, the directional commands, so is in many ways another doorway into Logo-style 2D graphics. It has a physics engine, with bouncy walls and gravity. Go crazy! Fun world!
Again, don't think of Codesters as striving to be a Python3. It's more Python2 flavored and is a stepping stone, an instructive environment.
Here in the education sphere, we get to deal with (and even design) such things. :-D Many of us here have been trailblazers, still are. Yay us!
Kirby