That effort didn't last long. I think this is the first I've heard about it since inception, the repo (assuming this is the right one, https://github.com/joshgiesbrecht/Glimpse, it was the only GIMP related thing that came up amongst a sea of unrelated projects with the same name) is hasn't seen a commit in 7 years and what appears to be the official site away from a forge (https://getglimpse.app/about/) is currently unresponsive.
