I beat the game. It was fun, but unless there is some way to heal it takes way to long to heal naturally. The minigame is a nice way to pass the time while you wait, since on low health the hear becomes faster and harder to predict. Maybe you could make it so that collecting red blood-cells heals the player? Still, much better with the ability to turn off the minigame, great job!
I don't think it would have made it much easier, just faster. Since injuring the organs requires damaging the body, you're forced to wait without doing anything, but if there was some way to heal, the player would have more constant action I think. Still, don't think I'm trying to say the game was bad at all, I very much enjoyed it!