As we can read in the first preview, it was an experimental shooter. Unlike most shooters of the time, F.R.A.G. had much lower speed and pace and relied on teamplay with unique heroes with abilities (Like machine-gunner with healing shields or soldier with shotgun and jetpack ). The only negative aspect mentioned in the review was that the game hadn’t got its face (Maybe at that time the developers hadn’t made unique models and left placeholders).
The beta was launched on May 19th, 2016, then the project quietly died. The true reason is unknown, but, judging the user reviews, people didn’t really appreciate this approach and even called it a shooter for grannies.