I've seen no mention of it on these forums, so, here is a quick note regarding a 2D game for the PC called Aquaria. Watching the video, I'd say the gameplay looks a little reminiscent of Nights -- but flattened into 2D. I'm sure that comparison is only superficial, but anyway, take a look:
I only found out about it because of a tenuously link on a linux site. While no linux port is promised, apparently the developer is considering one -- but suspects (with justification) that the linux market wouldn't make it worthwhile.
The blog for the game notes that they will release it when it's done and has been updated recently enough it's clear they haven't abandoned the project.