So I should try to make most lines 2 pixels big?
Also, I hope it's allright those textures were in PNG format, not in HEX
Right, most (but not all) lines should be two pixels big.
If you can do monochrome bitmaps, that would be the most preferred format. However, PNGs are great as well. I'm glad you're not doing hex, because I always have to do stuff with the textures to make them work with Elimination.