Who's the artist for this? Did they do any other like this?

The author is Pluto, and they have a twitter with updates etc. I think this was one of their first works (I could be wrong) and I'm pretty sure they have said that they are planning more stories in the future since they loved writing dear door so much. They haven't confirmed anything yet but they seem like the type of author who loves what they do as well as their stories and characters so I think it's safe to say we will be getting more stories in the future!