No tree hitting - that's a rule of thumb. Secondly you should make the marsh more runnable. It's too bushy. And I don't know how difficult is to add control descriptions? Btw map is mirrored (see the lake)
Completely lost at c12. I was hoping to see the paths but they don't seem to exist in the terrain. With some improvements this couuld be really good - make the paths visible, get rid of tree hits, take more care with control placement, and make the vegetation less dense if you're going to use it for a night race.