I adore this. You perfectly took symbolism and imagery associated with the heart that would usually be framed as comforting, and distorted it in a way that gave me chills. This poem felt extremely powerful because of that, and I love the haunting imagery you've created here.
Cracks are in the molding of the drywall
where my fingers push in the heart
I'm tired of holding
The squelch it makes when it hits the ground
notifies me of my failure and makes my voicebox
attempt to imitate that horrifying sound
My knees slip in the flood of red from it's exit
And I fall in time with it's beating
Gorey giggles bubble from my mouth
when I end up landing face to face with it
Realizing that this is karma's dealing