I'm surely not the only person who prefers to use arrow keys to WASD, so surely this would have been picked up in testing. However, when I change WASD to the arrow keys, I can't exit the menu because it complains that something has an unbound key. Unfortunately, that something, whatever it is, doesn't actually appear in the keyboard config menu, so I can't fix it.

Same for me. I'm left handed and play with arrox keys.

Yep, same here. Will play this on a laptop while sitting in a comfy chair or in a comfortable couch, and WASD is more awkward than arrow keys.