Berlin (dpa) — Berlin in an alternative reality after the fall of the Wall. The evil DJ Dietrich has taken control of the city with a radio signal and the Berliners are his weak-willed subjects. That’s the setting for new PC game “Beat Slayer.” But there’s also resistance to Dietrich’s control. Mia is at the forefront of the emerging revolution. Her mission is to overthrow Dietrich and save her kidnapped brother. The gameplay combines roguelite elements with hack ‘n’ slay and rhythmic action. If Mia dies, the level starts over again. The soundtrack doesn’t just serve as a background, it sets t…