Looks really nice. I'm a big fan of Soulver[1] too, which is basically a more featureful and less minimalist version of this. I've also tried Calca[2], which seems really good but ultimately didn't replace Soulver for me.

On a tangential note, it's really nice to see that the Mac app scene still turns out these kinds of more experimental apps. Long may it continue!

[1] http://www.acqualia.com/soulver/ [2] http://calca.io/