Is the planned level editor update ever going to come out?

Hi, I have recently completed all areas with all S ranks and noticed there was an achievement for completing all "rewind" areas. Could anyone tell me how to play these levels to get the achievement, and also inform me how to get the true ending? Thanks!

Looking at the achievement list there's one for getting achiving a true ending in the game, I assumed originally that it would be something you get for S ranking all chapters but that wasn't the case so now I'm at a loss of how to do it. The only remaining idea I have is that it's tied to getting a specific rank in Endless Mode but that's it...

I have noticed that there is no dedicated button to restart an area. That would be pretty helpful for getting all S ranks in less clicks/steps per retry. Would it be possible to add it in an update?

I'm just posting the video link directly here because I get an error when trying to link my YouTube account and I don't know what causes it. https://www.youtube.com/watch?v=yuuZ5PZlEK4