This update has been uploaded to the beta branch. If you want to play with the new pack now, right-click on Epic Auto Towers in your Steam library, then select "Properties..." -> "Betas" -> "beta - Beta Branch." 
In the library, the game will now look like this:
Version 0.93 (BETA)
New Tower Pack: Necromancer Pack! Grim Tower, shrouded in sepulchral chill and bones. Zombie Towers, vampires, werewolves, ghosts and a pumpkin Tower! Immerse yourself in the realm of eternal darkness!
New Pack:
A completely new Pack of rare, uncommon, and common Towers with new mechanics
New resources: souls, blood, and chakras, along with mechanics related to them
Includes new tokens: 'Candle Token' and 'Blood Token'
Includes two unique special games from the start: 'Bloodlust' and 'Black Wax'
Other Changes:
Added the special game 'Bramble' to all Packs
Slightly modified Portal Tower
Other minor changes