A very solid visual concept. I really appreciate how you tied the theme into not only the gameplay but the visuals as well.
As for critiques I'd say that there was some weirdness with the changing platforms. It didn't feel particularly fair that some platform timers would change not just depending on whether you were in heart or mind mode, but seemingly for no good reason within the same mind mode stage. Maybe this could be remedied by a more visual indicator of when they were going to change? I'm unsure.
I'd also say that the movement felt pretty floaty.
Other than that I think you're one of the more creative takes on the theme and I really appreciate that about your game.