Nice game! At first I thought the upgrades were a little too powerful, I changed my mind around wave 80.
The thought of being able to buy friends is quite funny 5/5
For those who have problems getting 30 perfect because of build:
Use the decoration items that boost score with butter (for example)
Then you get 100% score very easy
+ so others can see
 "Epic Friends"){kind=icon}
 "Papa's Pancakeria"){kind=icon}