Interesting project. Thanks for sharing.

I am also a fan of DDG bangs and I see two missing features:

1. DDG supports bangs at any place in the query (even in the middle of it). I can search "topic !wiki" and it will work as expected.

2. DDG also supports following the first result in a query if a bare '!' is present in the query. Searching " hacker news !" will land me in the actual website without having to click anything in the results page.

Maybe you can consider adding these.