Very nice! Simple, effective, and actually very satisfying. I like that you went for a mechanical heart instead of an organic one, it's not much but that adds a nice touch to the game.
This is typically the kind of jam entries that make me think "I want to play more of it", as it's very easy and quickly completed, even for a jam game, but I guess it's smarter to keep a reasonable scope than trying to do too much and end up posting an unfinished project, so I cannot really blame you for that!
Congrats :)