Has potential...
LISTEN! This app isn’t bad, I use it all the time (along with other ones) but I feel like it’s not good enough. I have loads of these apps, however this one stands out (Not necessarily in a good way!)...
It doesn’t have many emojis, and who the hell told you this was Japanese-based.? Maybe, take inspo off of other emojis and put into your app? It could work.