I made Dead Run, a free running app where your pace controls a zombie chase on your watch.
Press START and the chase begins alongside your run recording. Running faster than the zombies widens the gap, but they gradually accelerate. Getting caught ends the game, not your recorded run. You can pause the run and chase together.
It's available here: apps.garmin.com/.../d58db356-9795-443f-b8c8-4c63f105bfa6
I'd appreciate feedback on whether the listing makes the game clear. Before installing, is anything confusing or missing? If you try it, was the gap display easy to understand?
The game deliberately becomes impossible. Pause at crossings and whenever needed; don't exceed your safe exertion to avoid getting caught.