It looks like one of those teenager's detective series I used to watch when I was younger. It reminded me of Ghostwriter, where all the clues were written by the ghost and could be anywhere and in anything available.
Actually that was the reason why I gave it a 5. If it was not so nostalgic to me, I gess I would have given it a score a lot lower.
The story of Spy so cool is kind of silly and doesn't make any sense at all. For a drama with only 30 minutes in total, it's also a bit repetitive and draggy. But, since it's so short, it was ok to watch and I don't regret it.
It seems that originally they planned to make more episodes but changed their minds and made only two. I wonder if it would have been better if it was longer but, unfortunately, don't think so.
As a conclusion, I have to say that, knowing it was just meant to be an advertisement of an app, it's really not that bad.