I'm glad to hear you managed to find the Hollow Knight easter egg, I was unsure anyone would be able to find that! And if you want to get through that room, you have to constantly glitch forwards fast enough to avoid the orange enemies. Yeah I did make this alone, that's probably why the level design isn't as great as it could be due to time.
Let me know if you get past that room (it's the last room), and if you're able to find all 5 easter eggs!