- Getting the license key was a bit slow, I went through the process of getting a reminder before the original turned up (I guess I'm impatient - but it's annoying when I had to hunt around my Junk Mail/Deleted Items to see where the license had gone). Why bother with a license for a demo?
- I find the appearance is too different to Excel so is a bit jarring
- The animations are cute, but not sure that they actually aid usability
- Although my initial reaction wasn't that positive it did actually grow on me but I think it needs an obvious immediate impact to demonstrate a clear benefit over the standard Trace Precedents/Dependents
- I can actually think of one scenario where this would have been pretty useful. I was designing a industrial modelling application that had been "prototyped" as an extremely complex Excel application - I had to spend a lot of time showing people that the calculations in the spreadsheet weren't what people thought they were - so having some way of automatically generated documentation of parts of a spreadsheet would have been useful.
Overall - not bad, but I think you really need to nail the exact pain points this would be useful for. Maybe also drop the Tony Stark/Avengers example - it's cute but might not appeal to your target market.