They need to make another game in this series. They are much better than the main series because you can actually reasonably play a game in a day instead of a month
It is my favorite level in any game ever. It will also probably take the average player the same amount of time as they took to beat the entire main story the first time. I love it
I first played it as the easter egg in Celeste. Months later, I came back to it on browser as well and started speedrunning it. It's a great little game to beat if you have 15 spare minutes of your time.