Antonym of 'Cascade'
Solution 1:
If you want to keep it simple, then you could say that Cascading is used in the sense of "coming down from above", so perhaps you could say Ascending.
Cascade can also imply something coming from one tier down to the next, to the next and so on.
In software engineering, a behaviour that is transmitted up to the next layer, up to the next and so on is often described as Bubbling. It's probably as good a metaphor as Cascading in your context, especially if you imagine smaller bubbles coalescing to form larger ones on their way up through the hierarchy.
So: Cascading Goals and Bubbling Reviews.
Solution 2:
"Roll-up" is generally used in these contexts. For e.g., reporting structure rolls up into Ms.xyz.
Similarly goals should roll-up into the top guy's goals.
Solution 3:
What you call "Goal Cascading" is what is also known as "Top-down goal setting", so the end-of-year process could be called "Bottom-up results reporting"
It's not very elegant but it is also not contrived.
Solution 4:
I´d call it aggregation or accumulation.
The reasons is my understanding of the process: A collection of small/low-level reviews are aggregated or accumulated into vewer higher-level reviews. Accumulated, if they are just colelcted and put together, and aggregated, if they are condensed in a way that the amount of information passed on does not grow with every level, but is "averaged".
Solution 5:
Reminds me of the terms fan-out and fan-in from Electronics Engineering.
http://en.wikipedia.org/wiki/Fan-out
Alternatively, how about "Snowball"? "Goals cascade out and reviews snowball in."