Hey it was my pleasure Jeffsu! I'm really sorry I didn't see your message sooner, I just finished deleting them all from the site. But I can tell you #9 was the 9th letter of the "Starr Engine" link, the letter "i". So that link was really two links in one. The #4 was I believe in the updates section, at the bottom where there was already an Easter egg, you could actually click on that Easter egg picture and it took you from #2 or #3 to #4. And once you found #10, that giant shiny green egg was also a link to the #11 egg.
When I made it, I literally was thinking, "If nobody plays this it'll have been a huge waste of time, and slightly embarrassing. But if even 1 person plays and enjoys it, it'll have totally been worth it." I feel bad it was such short notice, the idea literally came to me last minute as my wife was reminding me not to forget to hide the Easter eggs. I'd love to do something like this again in the future if there was ever any interest.