I love the expansive cast and the evocative setting, and the story functions very well as an introduction, but a few things were missing for me.

My main issue was I felt the story was proceeding too fast. We flew through all the expected story beats at such a pace that none of them had a chance to really land. I kinda wish this episode had been split into two to really build the tension and dread. I feel this story's strength is its inevitability; we know from the outset that Sunlight is doomed, so I wish we had stewed in that atmosphere for longer.

Secondly and more personally, as someone who loves (and is partly studying) botany: I wish there were more plants in this one! I understand it's unlikely Who will ever dig into the science of Krynoid biology or the biology of plants in general (that moment in the glacier at the beginning was a tantalising tease that hopefully will be picked up on in future episodes) but I personally would have loved to see it. At least we had one xenobotany professor as a main character!

And I was not expecting to hear Eight so soon!

This series opener really does a good job of setting the stakes and worldbuilding. Really intriguing start, a slow one too but I quite like that as it really helps create a good foundation for this series. Predictable ending, but exciting nonetheless!

Big Finish really overdo it when they have kids going "mummy" or "daddy" they make them repeat it like 500 times and it becomes obnoxious. Noticed this in a few releases now!

Very nice world building in this story it sets it up really nicely