Congrats on shipping! I was looking for something like this...

Is it possible to get feedback on the built-code? Do you have any feature down the line that will let people submit "solved" challenges and get feedback on their code from real front end developers?

That way, it would help catch bad coding practices early... or maybe you could include a standard solution with each challenge, kind of like how PluralSight courses have a "Before" and "After" folders, with the "After" folder containing the completed code.