It's definitely good to add multiple difficulty levels for the player to choose from. It's hard to find a balance that works for everyone. Even among first time players there can be a big gap in what level of challenge they might enjoy.
Viewing post in Call of the Horde jam comments
I checked out your game and it was fun!
In terms of difficulty, I'm thinking of giving players custom settings for the match. Ideally I would love for this game to encourage playing with friends. So having different game modes (just twist on the match rules) and having custom settings will hopefully allow some really casual almost friend slop fun.