Ignore anyone telling you to use Linux or FOSS tools that don’t have an industry standard grip. blender and obs are fine but if someone is suggesting vim or emacs over visual studio code or notepad, they don’t understand kids or ease of use.
Or you can just use tools which are not on the CLI. My mom uses Linux and she's 60, I guess a child can easily use Linux. In fact, I'm teaching a few dozen kids to learn scratch and Python on a Raspberry Pi 4 with Raspberry Pi OS and they manage just fine.
Please get a grip on the industry standard of teaching people. They're even doing Minecraft development on these things (although we compile externally).
For making games I recommend the Thonny IDE and Scratch as a start. They both work on Linux. Godot also works fine on Linux if they want to continue that route.
You can do all that with Windows aswell but for teaching our group of teachers found out that it just gets in the way of doing things when updates break stuff and you can't simply fix it by copying files around.
I can recommend https://wiki.debian.org/DebianEdu/ and a Raspberry Pi with Raspberry Pi OS. That should set them up for a lifelong journey of learning and excitement and bring enough tools to experience everything without relying on Windows which spies on them.