Warhammer 40,000: Boltgun is a "boomer shooter" (retro-style FPS) that fits the Switch portability ethos very well.
The Switch port is a "so-so" transition of a modern game built in Unreal Engine 4. warhammer 40000 boltgun switch nsp dlc update portable
Pros of Portable Boltgun:
Final Score (Portable mode only): 7.5/10
“Glorious violence, slightly choppy frame pacing – but the Bolter sounds heavy enough to forgive it.” warhammer 40000 boltgun switch nsp dlc update portable
Even if you don't grab the paid DLC, the latest update includes essential free features for every player: Horde Mode warhammer 40000 boltgun switch nsp dlc update portable
Warhammer 40,000: Boltgun on Nintendo Switch — The Ultimate Portable Purge Guide