@ rvL_eXile: Thanks for the hint. My model has 960 polygons. Well, after your post I recognized some, I could spare, you are right, thanks!
I made some models, but couldn't include them in my game (my game is on my PC in the town, I live to study, now in holiday, I live at my homevillage, so I had a look in blender on my laptop) result is not THAT good, but I am confortable with it, because it's my first try with blender rendering :-D

added some more stuff, torches will come next days:

I will try to bake shadowmaps in blender and use them in 3DGS, never did this, don't know if it's working, but I want to test it next days.

thanks, germanunkol!