Lots of us get confused about when to use "over" and when to use "more than."
You use "over" when you're talking about spatial relationships. As in, I hurt my knee when I jumped over the hurdle. (Note: True story. Ended up having knee surgery)
"More than" is used in nearly all other cases, especially with numbers. Our annual charity auction to benefit the food bank raised more than $10,000 this year.