Translation:The restaurant of my elder brother received a lot of good feedback from the customers.
In English, it sounds more natural to use "much" or "a lot" to describe a large quantity of feedback.
Also, "have received" also sounds a bit off; "has received" or "received" sounds right.
In English we use much only in questions or negatives. E.g. Do you have much free time? or I don't have much money. A lot of or lots of feedback