Although the inclusion of the WoGC is a great idea, and I'm forever going back to it, I keep thinking that it's missing something, and it strikes me that if if the various types of Goo were represented at the WoGC, it would be even more compelling!

Maybe a tally of the types of Goo that you'd let to the exit in each level could be kept, as well as the total?

Using the rare gobs of Balloon Goo to shore up wobbly bits of your tower would be really entertaining, as would using all of the new types of Goo that we'll surely encounter in the full version!  :D