You can only do what you can do. It's a learning process. If people knew how easy it is for developers to create 3-D world through automation in Unity it would blow their minds. Just focus on your story which is original and all the eventing. You can do the rest later. As I've said many times it really takes a great deal of will to create custom stuff, and it can be expensive as I have found. We're still on equal ground yet we've made our games differently. Barely anyone plays my game in it's about 90% original art / music and sound. That should be an example that you just have to keep trying and improving beyond what others are doing.