Once I had a sufficient gun base I moved on to making enemies.
I used this personal project to teach myself the intricacies of AI systems within ue4 and explored on how to craft a bunch enemy archetypes that felt like they had a unique identity.
It took me about a little over 4 weeks to make these.
All the organic characters were modelled by Jakayaki https://www.artstation.com/jakayaki
I made all the mechanical characters and the hard surface props.