Dead Cells was updated today by Motion Twin to add new content for free. You can find out the complete patch notes for this update below.
The biggest addition is perhaps the new playable characters from the various indie games. This includes Blasphemous, Hollow Knight, Curse of the Dead Gods, Guacamelee, and Hyper Light Drifter. You can find out the complete patch notes below, or have a look at them on the official website.