As a fan of the 5 minutes of gameplay I saw on Twitch just now, I must say that I think this game would be greatly enhanced by a duck expansion pack. I understand you're very busy guys and don't have time to flap around and stir up some innovative game design ideas, so I thought I would make a topic for the community to help you along with that.
4 suggestions came up in the live stream, so lets start with those before we go quackers and get out of hand.
#1 : Playable Duck character.
Make a playable Duck with the objective to turn the world into a pond to support the duck master race. His objective is to cull humanity so ducks will take over and become the dominant race. A flaw of this idea is master race ducks may upset people who think ducks are comparable to Nazis. The two are easy to confuse and we all know how over sensitive people are.
#2 : Duck armour.
Make equipable duck armour that will transform character's abilities into duck focused abilities. Necromancers would summon swarms of ducks instead of Skeletons. Pets become ducks and spells get duck particle effects. Duck armour is a really cool idea and maybe the easiest to implement without ruining the art style and by ruining the art style I mean the helm would have to be a bright yellow rubber ducky with the biggest dumbass grin possible.
#3 : Duck otherkin
Spells that transmute someone into a duck, so they're a reverse otherkin. Not as cool but it's the easiest option. Biggest flaw is that ducks would be weaker this way unless it's becoming a wereduck, but that maybe beyond the ability for an inferior non-duck artist to imagine and design in a functional manner. Could also lead to the issue of overly sensitive people being offended when they learn duck mating rituals and how vicious male ducks are when they get their end away. Definitely wouldn't want people accusing you of things because ducks are evil buggers when turned on.
#4 : Rip off Diablo
Secret duck level. Find some rare item, unlocks an area full of rabid ducks. Not as cool as duck armour but would be entertaining if QUACK QUACK QUACK QUACK QUACK out of no where. Maybe the boss in this area could be a sexy duck wearing a bikini, I think Matilda would be a good name. She can be the queen of the Duck master race, just don't try to steal her lipstick because she will mess you up.