Hi, Maia! Yes, I've been following your APs and I've noticed you mentioned your preference in that regard. :)
So, I'd say Mausworn is not going to be as prescriptive as Astroprisma, in terms of "this is the exact thing that happens, these are your options, these are exactly the possible outcomes".
However, it is not going to be as loose as OG Ironsworn. I'll have what I am calling Playsets, with step-by-step procedures of play in a tight loop for every part of the game, like journeys, delves, combat and so on. Each one will refer certain moves, and which tables to use in the correct order.
So although the events are not predetermined (there will be tables for encounters, descriptions and so on), the structure of play is very tight. My hope is that you will never be guessing "what now?", but still with the wiggle room of shaping things to fit your narrative. Does that make sense?