Levels:
*Old Jetpack Sax replaced with new Adventure variant
--I was very unhappy with the old version of the level. I am very happy with the new version of the level.
Gameplay:
*Fast-falling was broken in the last patch with the introduction of terminal velocity. It is now fixed.
Level Editor:
*Fixed issue where new guideline system didn't always work
3/2/21 Update (Adventure Mode.Exists == true)
Source: Steam Community (opens in a new tab)