@HELLRAlSERNice job dude, sweet update. Love the champion spawns, builds have to be a lot more dynamic. I don't find the heroes to be a problem like what the other guy was saying, they aren't even viable until pretty late in the game.
I liked the rebalancing of the waves, still feel like some are a bit weak (15, 16, 18,21,22,25) but I think certain rounds will always be easy for the majority of the standard builds (etc. light armor rounds are super easy).
Also, I've been meaning to tell you about a bug where if you try to juice a mutant after the build timer has ended it'll give you a message that says "its too late to juice" or something, but you will still lose the lumber.