If you liked Bullets Per Minute, pick up Metal: Hellsinger. Not a roguelite, but a very well-structured single-player story-minimal (~10-15 second voiced introductions to each level, occasionally a 1-2 minute, voiced cutscene between stages) game. It's more like Doom - set arenas, with set encounters across varying difficulties - with a more refined, BPM-style "shoot on the beat" system. And it sports an insanely good original soundtrack with guest vocalists from across the spectrum of metal.