The pit took your last soul.
Every kill drops DEMON sigils. They fall fast and they despawn — dive for them or watch your multiplier sit at one.
Gold cores raise your weapon level up to five: single shot, twin, spread, wing lasers, then the full fan. Taking a hit costs you a level.
Press SPACE to detonate a bomb. It wipes every bullet on screen and burns the wave. You only get two, plus one per boss.