As a town game, it's similar to Stardew Valley, except you'd be making chocolate instead of farming and fishing. And, of course, there will be spooky elements at play in the RPG, as the idea is that you're working as a chocolatier in a haunted castle.
ConcernedApe stated in a blog post that what really differentiates the game from Stardew Valley is that it will have "a greater focus on combat," with all of the code developed from scratch instead of being copied and pasted from Stardew. According to him, we can expect it to be more of an action RPG than Stardew.