This is a really good platformer! The use of being able to create platforms like you did is a neat additional twist on the usual jump, double jump mechanics and adds a great dimension to it! :)
I’m puzzled why you didn’t make a web build: if you’re unsure, when you export in Godot, make sure the name is “index”, and then just zip up all the export files. When you upload you then mark the checkbox for “this file will be played in the browser”.
The only thing that it’s missing are enemies or collectables, but I’m sure that the 100 line limit played a major role in that! It would have been good to see a goal rather than ending the game and setting you back to the main menu.
This has good art and music and the controls are good as well, though I ended up using the arrow keys for movement and the shift and space in the other hand for some of the more tricky areas, only changing when I needed to get movement and earth bending in some spots.
Great work with this, well done!