Riffing on this idea, but not, like, authoritatively--

Some possible basic questions for readers
-Were there any points where you didn't understand what was going on?

-How easy did you find the prose to follow?

-At what points did you naturally stop reading and take a break?

-Were the scenes and settings easy to visualise?

-Did the characters seem to act consistently?

-Were the characters sympathetic?

-Were the characters' motivations clear? When they weren't clear, did it seem as if you were meant to understand, or as if the mystery was a deliberate choice?


(I don't actually think these are all good questions - just brainstorming ideas. I'm sure they could all be improved, supplanted, or cut.)