First tower is best...high damage and very cheap. Really started to struggle with some of the later levels until I just started using only first tower, then they were a breeze. The other towers cost too much and don't do as much damage.
Controls are buggy as hell...using mouse clicks + arrow keys, sometimes results frame losing focus and character continuing in direction of last input.
Sanctify is straight OP... especially with Celestial Lightwielder - stats focus Will and Str.
Golem Magus is also fun with Bolt. Can kill most things before they touch you.
Amazing story!
If you are looking for a quick badge, this isn't it. Take time to enjoy this one. Beautifully written and crafted! Can't wait for Chapter 3.