The combo thing would benefit a lot from an audio cue, like matching the beat in the music or something.
Some upgrade node ended up being precisely underneath another so I could not interact with it. It branched off some lucky wheel node.
Investing into debt management seemed like a complete waste of time, since your income upgrades are far more powerful. It's not clear what makes the interest rate go up. No point to the debt twist ever became apparent to me.
In Chrome, the upgrade screen ended up lagging a lot, but actual gameplay was mostly fine.