Swarm Below

Reef runs

Swarm Below is a PC action game about fighting through underwater stages crowded with predators. You drop into a reef with one weapon and limited air. Your gear fires automatically, so you steer through the swarm, collect pearls and choose an upgrade each time you level up. The fish grow thick enough to fill the screen, and each stage ends with a boss fight.

After killing a boss, you can take a whirlpool to the next stage with your current build, or stay behind to gather richer pearls. Staying too long brings the Shades after you.