The upgrades get a bit few and far between around the billion dollar mark. The fact that you have to upgrade 9 items simultaneously to have much chance against any random opponent really hurts, too. Then there's the really odd "buying one thing makes everything more expensive" bit. I'm guessing this is all length padding, but it gets a little weird that I can leave my character arguing with, say, Dick Lotto for an hour, win 75% of the matches, and not be able to upgrade anything after that. And it's not that I've been ignoring autoclick or money upgrades either.
On the other hand, the story's exactly as much as you need for an idle game, and the art's perfect. The music fits in well and, for when a loop inevitably gets irritating, the mute buttons are nicely obvious.