I agree that I wish this cycled, but it's beautifully done, in any case.
It's a little jarring when it suddenly appears back in place as a heart, I think it would be better if all the "sand" jumped back up and reformed itself before falling.
I do really like how the sand really looks like its falling and isn't just a bunch of random flashes of red, which is a cheap and easy way to do it.
Like my heart... :(
I'm having a bad time...