Cool! Original style, and lots of content. I have a couple of comments:
1. The images in the slideshow on your "Über mich" page are lower resolution than the size of the slideshow. At least on my macbook 13 retina, the images are scaled up slightly from their original, making them look a bit pixelated. Perhaps try to set the WIDTH of the gallery module to "WIDE", and then instead limit the height to pixels, for example 5-600 pixels, and set FIT mode to "container" (disable the ratio) ... The images will then have to scale within the limited height.
2. Hide the "home" (index) page so it doesn't display in the menu? Most visitors will know they can click the logo to return to the home page, and it will make your main menu less crowded.