From now on the Windows/linux version of the game will also be updated on Itch along with Mac and Android. While I want nothing to do with Itch anymore I understand that there are some people who missed the Steam key deadline that may feel a certain way about it. So I decided to just update everything and be done with it.
If you get a "Key is needed" message just go to your Library and download the game from there, you should have no problems.
Have a good day.