Setting the difficulty was a difficult choice in itself! I wanted to make it similar to Ultra-Violence in E1 at the start but then ramp it up gradually as it went... so far, opinion seems to be that it's only the last couple of maps that get noticeably challenging.
I'm flattered that anyone says I got anywhere near the nonsensical level of architecture that KDIZD did ;) I've watched a couple of playthrough videos now and have noticed a couple of confusion points that can be smoothed!