Ha! Solveig was originally planned to have a more faithful design to the original concept. Glad so many people were shocked with the slight redesign! Designing characters in general is one of the funnest aspect of making a game for me (and the interaction between them). So thank you for enjoying them!
I wasn't able to replicate that bug, but I believe it stems from a miss export on the floor right below the door. There is a little chunk missing there when I separated the tower from the main building to add the dithering effect. I guess I could also just re-export the main building with that floor restored, or add a little platform collider.