There is a bug where if you restart in the level where you don't go up, the platform doesn't appear anymore. Also, when a platform is moving and there is no objects nearby, you cant really tell, you should add some particles for that.
I liked the sound and particles so you know that you are on a platform. I also liked how time freezed when you entered the other mode. Some parts are sort of hard to understand, but when you do, it feels nice.