Thanks for the feedback! The sfx, music, and animations were fine when I was debugging on Godot, but for some reason, after exporting as html to itch.io, it gave me the errors like the ones you spotted (there's even supposed to be a little particle effect when the player gets the star but it doesn't happen and I don't know why).
The electrcity animation should've been like a linear line of electricity with different sparking animations, but there was some complications in the code when the player touched more than one of the electricity collisions, so I had to space it out weirdly.
In terms of the run animation, I had to speed it up a lot because the walking sfx it made went really fast so I just wanted to match that (maybe I should put like a one-second timer each step the player makes or smth).
I did wanted to polish up the game if I had time, like the flow of gravity and difficulty, but after spending so much on planning the game instead of actually making it, it was rushed...
If you are referring to the 5th level with the moving platform that you cannot pass, there's a small sticky platform on the ground in which the player has to reverse gravity to lift the star up and then normalize the gravity again to make it stay on the platform without touching the electricity. It is hard to see, especially because I completely forgot to allow the maximize screen system in Godot...
Thanks again for the feedback, I'll try to be aware of these problems in future games!