The emojis could be better organized so that users could find what they want more easily; see how it is on Jumble. Having custom emojis would also attract users who love personalization. 
https://image.nostr.build/96bc75586821f646b4402e725df73ea6a657f80e84096332fe37a8c0d108e3cf.jpg

https://image.nostr.build/7b45cd37f3f58754c25ba74b552a4114f180633d0be93e5b0c6d52a59a3af158.jpg