Haven't tried this yet, but seems like a fantastic concept. Not shown in the landing page gifs but the "value search" and "tracking backwards in time from exception" features seem really cool. The gifs on the landing page are great but for an even bigger wow-effect maybe these features could be shown off too.
edit: in the Videos section there's a short value searching YouTube video linked: https://www.youtube.com/watch?v=CwXhy-QsZHw
Are there similar themed time travel debugging systems for Python or JS?