Overdrive and Goose WHisperer changed the landscape immediately. WHich was welcome as I was stuck. With almost everythign else, the geese were almost impossible.
However, the next level, I unlocked everyone else and it was nearly impossible to follow any one creature since hundreds were on screen.
So it went form success to game broken, at the same time.
So basically only damage mattered. The rest of the upgrades, I didn't actually understand. WIdth helped a little for geese. Since they were very fast and a wider ring helped,
It is a demo, so that was as far as I went.