GAMEPLAY: I struggled to grasp the core mechanic at first, mostly because the dialogue didn't appear for unknown reasons. Once I got it, it was a clever take on a puzzle-platformer, the tab part especially. I struggled with jumping off the moving hearts, but I think that's my fault. Of course, falling through the volume slider is a problem--I don't have any advice, as I don't make physics games, but do look into it.
VISUALS: With the UI flying around the screen, I definitely appreciate minimalism. The only complaint is the tiny bit of shading on the player box. Maybe some one-line eyeballs would work better. And be cuter. :3
AUDIO: None :( This would definitely be a good game to go full chiptune on. Do appreciate there being a slider (mechanics aside), not enough games do that. Even if there's no audio to slide. Keep that 'round.
THEME: I always appreciate some outside-the-box thinking in jams, and turning UI elements into platforms fits that well.