Heartbeat System Edit
The Heartbeat System acts as both a stamina bar for the player to run and a radar for how close the player is to a Spirit.
As you gets to closer to a Spirit her heart will start to pound. The closer you get to it, the harder it will beat. The screen will also pulse with every heartbeat. The white dot at the center of the bar will also flash red as fast as the heart is beating (if it's beating faster than normal).
The stamina gauge will deplete faster the faster your heart is beating, making it harder to evade the spirits. If your heart is beating too fast, some actions will become unavailable.