In what way does your game fit the theme?
My game fits the theme by making main character lot less powerful when he has less nearby allies.. for example he heals faster with more allies, he gains super powers when he has lots of nearby allies.. Also it is impossible to beat levels alone, there are lots of enemies.

Did you write all the code yourself and made all the assets from scratch?
Yes, i wrote all code by myself (from scratch), and i made all assets are from scratch (please read to the end). I just want to say i used substance designer and substance painter a lot, they are great programs, so they helped me a lot, i want to say while making wood and "Shooter enemies armor" and prisons chain armor, i used substance painters pre-made materials (i own these ), BUT i changed them a lot (i added moss / dirt/rust and stuff like that).This annoyed me a bit so i mention it.