Hey nice one !
Be careful though, with the webGL build we can't see the first room cause the webGL canvas isn't a 16:9 ratio. You can tweak the size of the canvas in Unity by going to the project settings -> player window, onto the webGL tab you've resolution :)
For the game i really liked your level design ideas with the mechanics, it works great ! One downside though could be the jump feeling that feels floaty, try tweaking it with gravity, drag and co !