All the bases are made to be played right ~~?
Can i suggest a something for the tree bases ~~? since i assumed it is most likely not used.....
Adding some Snipers.. or special units Archers/Rangers might help some....
Though i personally would really like a different lumbering system... like or a wisp or 2 to harvest on trees....or maybe even the Tree of life covered the whole ground inside of it.. which can spawn more wisp.. with upgrades which allows the increasing of rates per harvest....
thou again.. this might sounds like a pain in ass to balancing.... but it should be a bonus for that base since the entrance is hard to be covered there ?