このリンゴが食べていきます。
This apple will keep eating
something. (Killer Apple!!!
)
が indicates the subject, and 食べて is not the passive.
~ていきましょう is just "~ていく + ~ましょう".
みんなで literally means "by everyone/we all/together".
みんなで楽しい村にしていきましょうね!
Let's keep going to make this/our village pleasant/happy together!