Yay, I managed to finish the first level! Usually not playing such games, so for me this is an accomplishment and I at least wanted to give it a try. Lost my helmet right before the end. :D
Would it be possible to let players customize the keys for the controls? On a german keyboard, z/y are swapped, so it felt a bit weird.
For the WebGL preview on itch.io, you might want to check out the better minimal webgl template for unity builds, you can find it on itch.io for free as well. I'm using it for all my games to get rid of that Unity footer. :)