We posted these to Patreons on Discord a little earlier, and now I'm putting them here too for anyone interested :D
These are a couple of the early pieces of concept art that Aila put together when we were deciding what scenes we wanted in the game, and how characters should look. The Anna and Jan designs here were actually two of the very first things that Aila drew for the game, before we had even named it.
If you think the eyes and wings look weird, it's because the programmer drew over it to use them as placeholders art for the first kill scene, months before their monster girl forms were even designed!
If there's anything else you'd be interested in seeing, let us know, here or on Discord I'm sure our programmer can dig up the early stuff you might want to take a look at :D