I like the idea. But I think that a game about teaching git commands could be a lot simpler. Like an arcade style game where you can visualize all the git actions with simple in game entities in a very simple and clear manner. So when you do git add . you can see your changes (as game objects) moving towards a place in game reprasenting the staging area or something like that. So every git thing is represented by something in game and you can see it get created, edited, pushed, and destroyed.
This game looks good in terms of graphics, but I don’t it fits the git stuff. Maybe you could make it so that you are some kind of oversear setting in a command center, with all the ships visible in front of you in some monitor, and you command the ships from a terminal using git commands, but I am still not sure how you can show the git actions happening in a clear way. This will require a lot of work to make it accurate and educational.