This app was mentioned in 2 comments, with an average of 2.50 upvotes
How do you know they have any designers or artists at all? Designing a full emoji set takes resources and it wasn't as if Kii was an extremely popular keyboard
Edit: looks like they wound up releasing an addon using openEmoji: https://play.google.com/store/apps/details?id=com.zl.openemoji.openemoji