Here’s the current concept that I thought about.
You start with clicking on a book or something to learn Lua. When you learn Lua, you get Lua Points.
Lua Points and presumably other resources can be used to buy Scripts.
Sets of certain Scripts can be exchanged for features, which determine game popularity.
When a game has enough features, you can publish it and earn Robux over time. (yes, it will be called Robux, but I will have a disclaimer that in-game Robux is not related to real Robux.)
You can either update it with new Features or abandon it, starting a new game but retaining income from other games that you made.
The rebirth mechanic here would be DevEx, where you get rid of all your games and Robux to get a currency, money, to purchase stuff such as Scripters to help you earn Lua points or scripts.
That game idea itself is probably fine, however I recommend not having Robux has an in-game currency, as young players will easily get confused even if you say they aren’t related.
This is a really cool idea however you may need to add a in depth tutorial on how to use functions. I think this will be really cool especially if they add in video playback on roblox. But I wouldn’t use Robux I think it may confuse the user instead you should use @TheDemoDeveloper “Codebux” just because it not only sounds cool but it also well cause less confusion. As for it being allowed legally you are in the clear as long as your player base is not making malicious scripts.