This game is very good. But it's hard to know what you're doing at first since too many enemies spawn and cramped together and I didn't know that they drop something. Also is there a way to heal? and does the tree drop something when you kill it?
well you can kill them, they just have an absurd amount of health the highest in the game, but if you use frost bite you may be able to kill them since that takes a precent of the health off.
There is a ability when you inflict burn, you have 0.5% chance to heal 1 HP. If you have a great rate of fire with burn damage, this is basically vampiric damage and you become almost invincible.
I was able to destroy a tree and it doesn't drop anything. Very sad :(