Ah, thank you both for all comments!
@PseudoFanboy - thanks for this, definitely the most thorough and detailed feedback I've ever received - I agree with most but found it all useful. (I'd hoped that I could avoid having to mark doors as interactable by having no unusable doors that aren't marked as such with dialogue, being nailed up, etc - but of course I'd totally forgotten about all the one-way doors which undermine that by not letting you go back where you were.)
Camera locations and switches are definitely something where I'm still figuring out what works or not, so your notes on placement, implicit hidden spots behind the viewpoint etc are very helpful. Same with dialogue - I'm definitely trying to hit a sweet spot of length where it's supplementing or playing off the rest of the scene rather than distractingly long, at least for non-cutscene sections. The bugs you mention are useful too, and I'm glad you liked overall!
@jbarrios - really enjoyed watching this playthrough, thank you! It does highlight some issues for me to be more conscious about in future, like the types of rooms that tend not to play well with the camera, or when the writing doesn't work well with the chase sequences, etc.
---------------
For reference - my plan with these games is to make a few more and then try compiling them all into a little anthology. I have another finished one which I will be posting soon, and after that will move onto new ones, so won't be uploading a new build just yet - but I'll keep in mind all advice both for the future games and also for when I go back to adjust these for the compilation version.