I managed to get a grasp on a lot of basic stuff this week, thank you all for pointing me in the right direction.
I learned that the light shadow plugin could be used to make 3D topdown buildings, but I must be doing something wrong, because, sometimes the shadows dissapear. The light object is pinned to the player, and works most of the times, it appears that the "glitch" happens if the player walks to far.
I hope I was able to be clear enough, if not, I will try to explain myself better, english isn't my first language, so please, don't beat me too hard.
Here is my setup:
In action working:
In action stops working:
Download - https://filebin.net/hnttvcuv7djupnvq