Very cute and easy to grasp idea. I do wish the jump was a little more responsive and there were times where if the two hearts are too close to each other it was difficult to jump. At others the jump height changed randomly without a clear tell as to why.
Summary: the jumping needs tweaking as it does not feel good all the time.
Also, seeing that they are tide to a rope, I was expecting to be able to have the heart at the bottom just being held by the heart on the top while going over gaps. I get that the power up enables this but it just felt like something that should come as a given rather than a power up. I understand "it is a magical rope" and "game mechanics" I completely understand...but the presentation made it feel like I should be able to but I was not. Hope that makes sense :D