Nice game man! This could easily be turned into an engaging idle game I think.
It was kinda stuttery when you walk into the trees :/
And I just ran up to the first row of trees and then just held "D" while spamming "E" to collect 15 apples really fast. It's not that hard once you figure it out.
I think you should be able to collect more than 15 apples each Wave so you can challenge yourself and earn more money.