That was well put together! I think the starfield effect really tied everything together to make it feel like a game, it was fun to watch them slow down and speed up every time I jumped.
I'll try to be brutal for you :P
I agree with other posters the movement was pretty clunky, very slow. A couple tips for that: one is of course having a higher acceleration factor, you can set it up to calculate the acceleration based on top-speed and time-to-accelerate which I find useful. Another HUGE thing is when you turn around either instantly set the speed to 0, or have a way faster turn-around-acceleration, up to you, but that really helps things feel snappy.
Another thing is the jump, a secret about platformers is you really want the falling gravity to be higher than the rising gravity, really helps give it weight. (An exception I can think of is Kingdom Hearts which takes the opposite approach, it has a very low falling gravity) Here is a GDC talk about it: https://www.youtube.com/watch?v=hG9SzQxaCm8
Other things, I'd say try to prevent the platforms from intersecting, it looks pretty gross when they do I think. And there were times when the next platform was simply too high up, at least I couldn't make the jump.
But yeah, good showing! As I like to say, if people are criticizing that means your work is worth criticizing :)