This game is very clean!
It felt good to move around and the mechanics are well made.
If there was something to improve on, it would be readability.
Maybe the platform's "puzzle piece" should have different colors depending on their behaviors, to separate the ones that move once you jump, from the ones that mirror your horizontal speed and the ones that jump with you.
There's also a small bug, you stay in your jump animation when you land on a platform moving up.
It would also be nice to indicate it when you can't fall off a platform since I got confused at times.
The game felt great and could really be extended with more levels. Very fun!