TL;DR
Divine Frequency is a new FPS in Early Access that uses the GZDoom or UZDoom engine.
Divine Frequency is now in Early Access. Reports say the game is a survival FPS that uses the GZDoom or UZDoom engine. It currently has a Windows version that can run via Proton 11 on Steam. Players noticed the game uses heavy screen effects, particularly during the intro sequence. While these effects are still present after the first sleep in the game, they are reported to be less intense than the opening.
Divine Frequency · official art via IGDB