Imparfait vs. passé composé

The first part of the narrative is background information from his childhood - habitual activities and feelings etc not specific events of note :

" I used to love going to the cinema [US: the movies] when I was a teenager. I often went (there) with my best friend Bruno. We always bought (some) popcorn and we (always) sat in the middle of the theatre. Our favourite films were horror films .... "   

- these are all ' used to do/would do (past, not conditional), were in the habit of doing '  - this is described appropriately in imparfait.

then 

there is a  series of clearly defined specific events, highlights of his childhood visits to the cinema - seeing each of the Marvel films :

" and we also saw all the Marvel films " - this context needs the passé composé to convey the specificity of this series of ' individual events '

and then 

it is in the present, and using present tense as expected :

" But now that I'm a bit older, I prefer watching films at home. I have a big screen and a good sound system, and I don't have to listen to other people. Plus, I can pause the film when I need to go to the toilet [US:bathroom]! " 

The links below are relevant and 2 of the best presentations I have found on this :

This first link is in comprehensible French throughout, covering imparfait and passé composé from the basic uses to intermediate and advanced level

https://youtu.be/3rpQ5xeFneg?si=JUn9OWluqOnPVKxN 

while the second link is very practical, with a good simple 'cartoon' at the end demonstrating how imparfait and passé composé complement each other in a narrative

https://www.frenchtoday.com/blog/french-verb-conjugation/passe-compose-versus-imparfait/ 

Thanks Maarten for these excellent resources.