> After half a year we moved on to our second language: Lua, specifically in the video game system Roblox. I almost wish we had skipped this one because it was a bit too advanced for these students, and I was not familiar with the language and the system to begin with.

Teaching something, like a programming language, that you don't know is really hard. But in this case there are 100's of Lua tutorials around Roblox. I would think that they could have done that.

While it's $15 per learner, an alternate could be Pico-8 https://www.lexaloffle.com/pico-8.php Lots of tutorials and lots of demos to look at.