I think...

• Title length

  Characters in the extension name.

  10

• Description length

  Characters in the listing description.

  267

• Media assets

  Screenshots and videos on the listing.

  1

• Has promo video

  Whether the listing includes at least one video.

  No

• Languages

  Declared language locales.

  1

• Developer website

  Listing exposes a developer website URL.

  No

• Contact email

  Listing exposes a contact email.

  Yes

• Keyword in name

  Case-insensitive substring match in the name.

  —

• Keyword in description

  Case-insensitive substring match in the description.

  —

• Keyword occurrences in description

  Count of case-insensitive occurrences in the description.

  —

• Category user-count percentile

  Share of same-category extensions with fewer users (null if unknown).

  68.4

These are transparent listing completeness / keyword signals, not a prediction of Chrome Web Store search ranking.