This is... horrible! Zelda Classic has thousands of player made adventures for free that are leaps and bounds greater than this. This, as your proof of concept, isn't deserving of anything. Was the kickstarter a joke?
The game it's self is java, meaning if I were to use an iFrame it would still be safe. If you don't like the thought of this, then go to Agar.io our neutral ip!
I don't know how to delete the extra game.