According to YC the online coding education market is too crowded

I don't think it's really possible for a market to be "too crowded" or "too competitive" if you can create a unique and superior product.

Joining a commodity market with a me-too clone, however, would be ill advised. But it doesn't seem like that is the case here.

I do think that the education market is tough. There's so much out there that's free.

The nice thing about the passion projects in this space is that competitors openly share ideas and implement new findings very quickly. Maybe they won't all be profitable, but they will all add constructively to the industry.

Congratulations on your launch, and your approach looks unique enough to have place in face of the many online coding shops.

Just don't get complacent with your revenue, it really isn't much.