Particles not visible over a 2D layer

Hi,
so I am making a 2D game, and I wanted to add some blood to my game. I made the particles in Unity Particle System, and I scripted it so it is only shown when my character is dead. The problem is, the particles are not overlaying over the game Scenery. I tryed everything - from changing the layer to putting the Particles UI to diffrent objects, but nothing seems to help. Any idea what could cause this problem? Did I miss something while setting up the particle system?
Thanks.