Absolutely adore the style of this one to death. Possibly the only example I've seen of a game taking inspiration from German expressionist cinema. Every zig-zag, angle, stripe, and line just looks perfect. The parallels with The Cabinet of Dr. Caligari were perfectly executed, it all left me wanting more, and I can say this is exactly the type of stuff I love to see in indie gaming.
Unfortunately, despite going through every area and trying just about everything, I'm still struggling to find two of the forms. Naturally, I would dig around through let's plays on Youtube, or walkthroughs on the internet, but I've still found nothing. A hint would be great - the more cryptic, the better!
Edit - figured it out! Turned out to be in the last place I expected, heh.