Those Days is a slow-paced and thoughtful piece about life, growing up, friendship. It's nostalgic, a bit sad and a bit uplifting. As I said: life.
The main character reminisces about those endless days of childhood, spent with his best friend.
It's quite a stretch to call this an interactive story. The interactivity is limited to clicking highlighted words now and then while the railroaded story inevitably unrolls.
The clicking does serve another purpose however: that of pacing the story and forcing the player to take in the deeper meaning of the short paragraphs. This is helped by carefully judged timed text that slows down the reading tempo just enough to aid in letting the words sink in.
I really liked the changing background colours. They came across as symbolic of the different stages in the life of the protagonist and of the state of his friendship with his best friend.
A moving story that makes excellent use of the Twine-format to enhance its impact.