Your death/reload function seems to generate the world and only after overwrite the old save file. The consequence is that the Perma-Death can be avioded by simply pressing F5 after dying. It reloads the browser and stars the game from the last save point including all items.
There has been a small fix. You will still have lost progress after refreshing the page, but the world can still be the same, even with an empty seed. To avoid having the world being regenerated each time you die, i would recommend using a seed.
the double jump can be used as a triple jump if you hold down space and then press it again. also, the moving platforms, when touching the ground, you can use to no clip.
and for some reason the screen is also is a link to your website and wont let me plan i just found out hoe to do multiplayer when this happened please fix
You need to do a hard reload of the page, so the js files are updated in the browser cache. Or in Chrome click right and choose inspect from the context menu to open dev tools, in the Network tab, enable the checkbox for "Disable cache" and then refresh the page.
and for some reason the screen is also is a link to your website and wont let me plan i just found out hoe to do multiplayer when this happened please fix