Hey, the balance has definitely been tweaked. The late game is harder for sure. And I'm pretty sure the multiplier is working :)
playing again and I don't think I'm "further along" build wise, but with fast forward off it seems that the enemies are defeated much more handily.
Yeah, for reasons I don't really understand, the FFW doesn't accurately do everything and the same speed. It's on my bug list atm
fast forward definitely makes the enemies come faster more so than the towers fire.
only other thing I can suggest might be some way to save(rogue style of course) just because the end game can be rather long.