Cyberpunk Corporation is a mission-based first-person shooter set in a city controlled by a corporation you're fighting. You take jobs from residents, clear objectives, and work through the corporation's forces with a small arsenal.
The cyberpunk setting supplies the atmosphere; underneath it's a competent browser FPS with the standard toolkit — iron sights, weapon switching, sprint.
WASD to move, left click to fire, right click for iron sights, the mouse wheel or number keys to change weapons, and shift to sprint.
Yes — a corporation has taken over the city and your missions come from residents resisting it, which frames the objectives.
Yes — it runs in the browser with nothing to install; lower the settings on older hardware.