I feel with you, but don't delude yourself in to avoiding any kind of marketing. Marketing is an evil necessity, especially if you are starting from scratch by yourself. That's just the nature of our reality. To scoff and say you're content is an ego-fuelled move, one that pushes the problem off for later.
Don't do that to yourself. Learn to market ethically at least, or else it's a real waste of time as your next startup fails because you avoided marketing.
"core audience of indie developers" I thought that the engine was hugely popular beyond games? from what I recall indie games were just a small portion that used Unity.
