Haha, sorry about that
I don't remember exactly when I added it (I believe it was shortly after DonDoli played the level on stream). This thing is actually not meant to be an easter egg, but rather a
"Hey, what are you doing trying to break the level... you naughty player you" joke thingy inspired by the level
Looking for Flynnas that you shouldn't be able to reach without using cheats/exploits (much like the inaccessible "nightmare" area in
Exploring the Golden Land). In fact, I never expected it to be found at all (man, you're really through!
Even when using the editor, it's not something that's easily noticed)... nor did I expect for it to have such a strong impact
By the way, you're right on the money about the way that wallswim was originally discovered. It's a technique often called "triple jump" (even though it's not exactly that) that works pretty much as you described and it's VERY hard to pull off (for me anyways... I can only manage to do it successfully about 1 out of 30 tries or so), which is why I never planned for it in my original design. Again, not something I'd use for hiding secrets/collectibles/goodies, not even easter eggs I want players to actually have a chance of finding.