Hello, everyone!

So, I am currently working on a PbtA hack that I'm very excited about, and I've already tried it out with a couple of friends. Next week I'm going to do my first full session with my usual group, and eventually I'd like to open up playtesting to others as well. In order to get the most useful feedback from playtesting, I'd like to distribute a survey of some kind, and I was wondering if anyone had any advice about how to come up with useful questions and prompts for playtesters.

How have you done it for your own games in the past? What worked and what didn't? Are there any existing resources on this topic that you could direct me to? I know what kinds of reactions/interactions I'm going for, but this is one case where I probably wouldn't want to use leading questions.