It sadly does not work on WebGL, but perfectly works on the Standalone versions!
Viewing post in Separated jam comments
For the next WebGL build of yours, you need a ssl connection to be able to open a Webrequest from a Webbuild (at least on Itch.io). There are some comments on the dremlo side telling you to send an email to Carmine and donating 5.- then your highscore will also work from android and webgl (once you updated your URL) ;-). Worked for me in my game (altough I fucked the text input (for the name) up soooo it only works in the computer builds... so fail? ^^ Have to fix that after the jam