I doubt it was your intent, but at the very least you should give the credit to tixy.land, with a link, front and center right there on the page.
Also, something as simple as using a different color pair would really help to distance it from the original.
I don't think "deceptively" is the best word here – there's no money or private data involved, at most a small bit of street cred. The near-identical look was intended to preserve the simplicity of the original. Note that there's a reference to tixy.land in my comment here, in the README.md on GitHub, and in the tweet that's behind the "more info here" link. Anyone looking to do more than just idly play around with this tool will come across one of them.
But I get your point – I'll be adding an unobtrusive link back directly to tixy.land soon!
EDIT: Done.
Edit: excellent, thanks for listening.