Watched the last stream and looked up a few historical types of insect repellents after hearing everyone complaining (rightfully) about midges.
Bog-myrtle leaves have been used by campers and hikers as insect repellent for centuries. They're easy to use, just rub the leaves on your skin. Also used to flavour beer before hops became popular. I think it would make a decent early game repellent, to keep midges away for an hour or so.
https://en.wikipedia.org/wiki/Myrica_gale
Birch tar is a much more interesting repellent, especially since it has been produced for more than 200,000 years. It is a substance created by heating birch bark in a sealed container, producing ashes and a very thick tar. It can be applied directly to the skin, providing effective insect repellent for up to 2 weeks.
https://en.wikipedia.org/wiki/Birch_tar
It's also worth mentioning that birch tar was used as an adhesive, as a tanning method for making very tough leather, making medicines and even making 5,000 year old chewing gum in Finland. Chewing gum when?