so a few of us were talking about Baba is You and sharing levels a few weeks back, and it eventually escalated to a full on mini JUMP project of 4 people:
FrozenQuills, GbreezeSunset, Lazy, and Medic
Expect puzzles, shenanigans, and puzzly shenanigans!
It is expected for you to know at least the main game of the original Baba is You, but you can probably give it a try even if you haven't played the original.
Get Baba is JUMP here.
You can install custom levelpacks in Baba is You by unzipping the folder and moving it to the Worlds folder under Data:
Program Files (x86)\Steam\steamapps\common\Baba Is You\Data\Worlds.
(unfortunately you cannot play custom levelpacks on Nintendo Switch, yet)
And here's a playthrough video by Lazy for those who don't have Baba is You or are stuck on any puzzles:
enjoy!