If one would include retro inspired arena FPS into the category of boomer shooters, then I would name “TOXIKK”. They had an absolutely cringeworthy and immature marketing, the game was a pretty boring and simply incompetent copy of Unreal Tournament with worse artwork and maps, both the developers and the community were - fittingly - quite toxic people and in the end, the game just had almost no players. It was dead on arrival.