I think you need to fix the achievement/completion placeholder images. because had I wanted to share my progress it would have looked silly. and would have cost valuable PR. just saying. looks good though.

I was a little disappointed by the "repl" on the home page, i had to basically type exactly what was asked else it had not idea what to do, not very good for learning.

good job

Thanks for the feedback! I agree with your comment about the homepage console. Achievements/completion is something we'll definitely spend a lot more time on in the near future :-).