On the visceral side: put up some example videos of use. If you can't do it to the level of polish you like, get someone else to do it for you as an unofficial one. IntelliJ is already slow, and I'm worried about event-recording debuggers being only useful for small programs -- larger ones eat up too much RAM and cpu overhead to be tractable.
On the power side: show some sophisticated use cases using real libraries and real problems to fix. What stuff can I find out directly that I can't easily do in IntelliJ?
Can I directly query the DB? Can I use those queries' results in regression tests?
When I read the page, I thought "Oh, like the valgrind family of tools for Java, nice." So perhaps some pre-baked validations using the tech you've built could be useful.