I really enjoyed this game. And the mechanic is actually somewhat similar to what I did in my entry, which I think is fun. In my entry, I freeze time, and you slow it down. I find your mechanic better though :D
I wish the player could go through the platforms from underneath (jumping from below,) because I died many times from hitting the platform.
I also did my entry in Phaser, and I’m going to look at how you made the player follow the platform when standing on top of them. I used matterJS instead of arcade physics, and I didn’t have time fixing it before submitting the game, but I think your entry can help me solve the problem.