FYI There is a free SRD of the Blades in the Dark rules, which may help. Here’s a link:
bladesinthedark.com
If you don’t know how play is meant to go, the Galaxies playtest material would be incomplete, at best. As much as it draws on the PbtA principles, the game plays pretty differently.
I wanted to give Worlds in Peril a try and then the Galaxies Kickstarter went live and my group has been playing a lot of Blades lately, so it seemed like the logical choice. We may try Worlds in Peril at some point. I’m glad to hear that it’s a solid game.