The project is really interesting, I was taking a look at it and the truth is it is a very great alternative, there are things and opportunities that I didn't know about.
Your proposals are very reasonable. Categorized by beginner, intermediate and expert levels.
I'm not sure that the blue color is the right one for the page, it makes a lot of noise to me, maybe it's just my opinion, I feel that the page is missing something more, just something more, an extra touch and it would be perfect.
The typography (font style) seems correct to me.
Maybe, just maybe, I would try adding some kind of custom mouse pointer, as long as it didn't make the page load too heavy (something like a little Aladdin's lamp or a genie maybe?)
I hope this feedback is useful to you in some way, I am here not because of the rewards, but because I really find this project extremely interesting, I see it as very useful.
I assumed Alladin inspires it.
I think someone else also recommended it. I will forward your feedback to Peakd's suggestion channel.
I added the link in the post, you can comment your feedback if you want.