Thanks for trying it out, and for the kind words! 144mil is a really solid score; kudos! That's around where many of my runs come in, but things really explode from there if you survive another loop or two through the song while keeping your combo up; I only had a handful of runs get above 1bil in all the time I spent testing.
P.S. I still haven't beaten round 3 of your game, but I'll keep trying :P