Absolutely phenomenal.
I love the way you used very subtle elements to express the different game mechanics, and the radar-effect was intuitive and an excellent use of the theme. The movement was smooth, though I might have sometimes wished that the pulses would come closer together so I could move faster. It was tough to be patient sometimes, but that's part of love I suppose? It's rare that I play a jam game all the way to the end if lose multiple times but Heartbeats kept me going with its excellent design.
Best jam game I've played in a while, and it reminded me a lot of Thomas Was Alone. ^o^