Well Nisto, this game is called Another Mind. I think that even if we don't know much of the game context, it's safe to go with "mind"! However, just for some backstory, the protagonist of the story is involved in a car accident and wakes up in the hospital with the consciousness of another mind (the role assumed by the player). I haven't played the game so I don't know for a fact or anything, but the safe assumption is that 心 refers to the mind.
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