I know that HC originally took Lilith's code but they created a great game with so many great features that SH is now emulating.Every "new" feature in SH has been in HC for quite some time.New hero Konrad is Chemist in HC and the list goes on.
We never copied anything from Heroes Charge. As stated by other players our company even won a lawsuit against the developer.
When you see something in other games and see it coming to our game later it's because these games copied our original Chinese version. We have a very dedicated team working on improving our game, the Chinese version from the game was released much earlier than Soul Hunters so there is content that has not been adapted to this version.