I think that the cemetery should have a lot more space than it has today, which will significantly reduce the problem with dead bodies.
It would also be a good idea if you could draw an area the grave keeper is working in, a civilization with 50 nuggets shouldn't really have grave yard problems, what happens when you have larger cities?
Also, I think the infection risk is way too high, nuggets should primarily try to avoid an infected area rather than running through it constantly.
(as a norse) I think the pyre is a cool feature, although way to expensive. Negative effects could be pollution or something.
As it is now i usually pick up dead bodies and fling them out in space, fastest way to get rid of a rotting problem..