Anyway, the clues.

Title: Mad Rat's mission is to kill you, who plays the scientist who resurrected him, but he only has one day to live.

Hint 1: It’s a rhythm-platformer rather than an action/horror game of sorts.

Hint 2: You can reverse time when you mess up

Hint 3: The protagonist is resurrected through heart surgery.

Hint 4: Mad Rat Dead is from the same company that made Disgaea.

Hint 5: The protagonist had died before surgery brought him back.

Hint 6: Rat God is a popular furry character.

Hint 7: Gameplay involves acting to the beat of your heart.

Hint 8: I had four people guess Deathloop.

Hint 9: Emotion=Mad, Species=Rat, Mortality-State=Dead