I am creating a series of educational pre-k HTML5 games, but I haven't been able to stumble upon many portals that have a dedicated Educational section. I will be submitting to the others, but I fear it'll be buried in games not of its type. My question to you is do you know of any hidden gems out there? If you develop educational web games, where do you submit?

Clay.io has an educational section. We're working on driving more consumer traffic to the site - right now it's not fantastic, but it's easy to add your game, and we help with distribution to other sites and marketplaces as well.