randompast

Yup, that's what these people do: https://blockly-demo.appspot.com/static/apps/turtle/index.html

I don't know much about them, but could something like webworkers solve this issue?

They click a button and it spits out some equivalent of what you're currently doing for the URL, Then, they have the option of copy pasting that and saving it...

There could be a while loop the player makes which checks if a key is pressed and then does an action or series of actions. It seems like it'd require...

I'm thinking something like fightcode game (lasertag) could work on this with blocks that give information about players and obstacles.