Not working!!

Is there a reason why the kimoji app isnt working? It literally stopped working a few days ago and hasnt worked since. It wont even open. I tried to uninstall and reinstall it thinking I could reset it and still nothing. I paid for an app that I enjoy using and would like to use. If its not going to be fixed I would appreciate a refund.

AstraOnTheAir about KIMOJI, v4.1.0