Nice tool, it seems to work well!
Quite a concidence, first we have no hacking minigame online for well over a decade and suddenly we have two after I very recently published my version. Any chance you (or any AI) took some inspiration? Not that I mind, go ahead! But crediting would be nice if that was the case. 
And if it was totally independent (which easily is possible as it is a nice project to build on), what a fun coincidence. 
That said, I like how your version works well in the browser, I played a few rounds and it seems to run smooth!