Hi. First of all, thanks for your comment!
There is no WebGL build at the moment because I had a problem with the cursor. It's not about C# (the game is scripted with GDScript) but I'm using a custom cursor that's too big. The error message is related to this.
I'm trying to fix this but it means recoding the whole hand behaviour and I'm not sure if that's allowed by the game jam rules :/
And yeah, I also need to pimp the game page a little bit too >_<'