Well, he said in the past that he was an artist and not very good at coding.
I can totally understand that. AQE has some of the best art I've ever seen in an adult game and even though Grim may not be very good at coding, he managed to pull off one of the best metroidvanias I got to play.
I was just complaining about how Ellen is pretty much a puppet in the gallery scenes with textures containing dismembered body parts to make animations more easily but the gameplay textures are all split into frames (which makes editing them a pain in the ass).