One more thing I noticed are the hearts that move from one place to another:

When you first get close to them they move to the other spot. When you then get close to the new spot, they teleport back to the original spot and have the animation again

In addition to my previous comment I found a few more things I'm note sure are intended:

• If you get damaged and reset (Spikes, people or blades) the hearts don't reset
• If you get damaged and reset, you can rewind time and be teleported back to where you were
• When collecting a heart in the rotating collections, the remaining elements are arranged differently
  • This is especially annoying when a spike ball is teleported to where you just collected the heart, resetting yo
• While rewinding time you cannot be hurt by moving elements

The game is fun and I really enjoy the time reversing mechanic. One thing I noticed is that if you rewind time while falling and then stop, you fall down extremely fast