Question about ParticleEmitter Orientation and Outline

Here, using the emitter, I noticed after zooming in that the outlines of my squares were black. I don’t know exactly why. After doing some research, I couldn’t find a solution. The second thing is that, after trying a bit of everything, I couldn’t find a way to orient the particles other than with the 4 options available. Here’s what my squares and their outlines look like (1) and here’s what I can’t do about the orientation (2)

1 :

2 :

Good vibes