Thank you so much for playing it! The jump was for a feature that never made it in. I was going to have a little platformer come up after you collected each set of heartbeats for that third wild card, but I ran out of time. You should be able to get every heartbeart with just the wasd keys, and moving the mouse around helps you locate them.
For some reason the spatial sound is slightly more intelligible with the windows version over the html5, but it's very hard to tell.
I hope you'll try it again. The heartbeats randomly populate, so it may be easier to get a heart next time.