I habe a 1x1, a 2x2, 4x4 and a 8x8 pixel test sprite. The Problem is, unity is not properly projecting it when i set the game resolution to 64x64 (pixels are not projectet properly, color blending, squers get to circles etc. etc.. If i try to do 640x640 it works perfectly. the problem is... there are to much pixels now (duh) 

Is someone also working in Unity and have an idea how i can fix that?

If you figure it out - let me know D:

i actully found some stuff here in the forum: https://itch.io/jam/lowrezjam2016/topic/19276/unity-setup-request 

Have you checked out this topic? https://itch.io/t/129513/unity-guide-low-resolution-shenanigans

haha we posted at the same time, but the links are different. 

this looks promising:

https://github.com/RyanNielson/PixelCamera2D