The theme and special feature implementation is executed very well. Gameplay and fun factor is on a high level, we had fun playing your game. The difficulty is on a sweet spot, as it was tough although challenging. Great idea with the gates and color, would love to see where would you put this idea when you would have more time. However, would be good to have sfx for loosing a heart, as there's no feedback (other than turning heart gray) for the player.
Well executed.
~ jog1t