The DLC is good and the new boss and mobs are cool, the levels also look pretty but, the they are too long, and the huge amount of slimes on higher difficulty levels make me want to pull my hair out.
The music is average, and is probably the weakest out of all of the DLC.
Both this and Creeping winter should have been a part of the base game, So I wouldn't recommend getting them unless you got the ultimate edition.
If you are really unsure about getting this DLC, and already own the base game, you get a free level called, Treetop tangle which lets you try out what the DLC is like before buying it, the level is free and wont require you owning this DLC to play so you may as well try it.
Also if you don't like poison mechanics in video games don't buy this.
Since I like this game, I like this DLC (Even with all the problems it has) so that's why, despite all the things dragging it down, it gets a recommenced from me.