So here's my experience with this campaign:
I played through as the Ranger.
At the start I noticed a pretty big flaw with your raven enemies, and it's that they can surround you very easily and deal a lot of damage. 1 damage times 50 hits per second equals one really dead ranger in a matter of moments. I imagine this was designed with the paladin in mind more than anything, and it shows a lot of the time when you're expecting the player to shrug the ravens off like they're wimps. It's hard to when you can only shoot in a straight, narrow line, and when bombs have a timer on them a little too long to be useful outside of kiting.
The second flaw I found was in level length - too much of it. This became really noticeable during the forest where you had to collect candles - I wound up running around for an hour because there was no clear indication of where to go or where I should look. Eventually everything was dead and I had to wander around a completely empty map with my minimap open the whole time in order to figure out which corners I didn't quite walk into before.
A third flaw was the use of atmosphere. When the levels started they set up some really nice atmosphere and a decent concept for a level, but tying in with my second flaw above, after a while it just sort of stopped. This is evident in the tomb level when it starts out - a nice crypt full of breakable sarcophagi and bone ornaments... And then you turn around and make 90% of the level a single-tile-wide maze over a black abyss. What the heck happened? Is wandering around aimlessly with a lack of visual stimulus something you found fun while testing?
Overall I found a lot of bad mixed with the good, and the campaign felt too drawn-out and very... "disappointing". There's potential here, but it doesn't feel like there's a good sense of direction for it it to follow.