Pretty good game! It really felt as if I was exploring a living and breating world. Since I think you're going to continue on this game, let me give you some feedback.
First of, I think that the moving platforms need to be faster because dying means that you'll have to wait a lot and player will get a bit bored.
Secondly, the gravity of the player is a bit too intense so I suggest making it lower, because whenever I fall it feels like i'm falling at light speeds.
Last but not least, I think some enemies could be useful to help make the world feel a bit more alive.
I hope everything goes well for the future of your game!