Just a quick update. We had our first session yesterday. It was a little rough at first, everyone talking over each other but ae rolled for initiative for interactions out of combat, and everything after went without a hitch. Except the boss fight, I had some real bad rolls and my players put the aberrations down without taking a single hit. Still, they had fun, and I had fun. Owlbear was fine, it did the job. Wish it communicated heights better but, eh, making the maps in rimworld probably didn't help.

Thanks for the help! I quite like being a DM.