I've uploaded a fairly self-explictive project showing my aim.
As you can see when is executed, there is a wave advancing through the canva's white space.
I'm trying to generate several waves so that I can simulate light in an schematic way.
My objective too, is to make those waves to disappear on crushing with the red sprite. This is not easy for me, due to everything is happening inside this canvas.
Have a look on the advances made on the project. I think it's quite interesting for making tutorials afterwards: