No apology necessary.
Here is some feedback on your case study:
- I love the storytelling aspect – I felt compelled to read on
- It would benefit from an english edit. There are a few grammatical errors and at times it's a bit verbose.
- Your process is solid and your documentation of it is fantastic. I love how aware you are of outlying issues.
- A light grey background, slightly darker text, a larger font size and a shorter line length would improve readability.
That's about it TBH. I think you've done an amazing job.