Feedback time!
I have some mixed feelings about the minigame at the end of a Nightmare run. On one hand it's quite fun, but it's also luck dependent, meaning that there's a good chance you'll lose a flawless run to something that's mostly out of your hands. It feels pretty crumby when that happens, but I also don't want to see it scrapped as a whole, so I don't know what the good compromise would be in this case.
Speaking of the clown minigame, a friend of mine discovered a bug that lets you skip it:
This next piece of feedback is something I was thinking about at the launch too. It'd be nice if you could compare the doppels you let in to the person they're mimicking (for example, I've lost a few runs due to not noticing if pupils were missing/there when there shouldn't be any, so perhaps in the post-game analysis could include a picture of the normal eyes and the doppelganger's eyes).
Another idea is a gallery for everyone you can encounter, unlocked as you encounter them, so you can go back and look at the normal residents or doppelgangers whenever you wish.