PvP Games is a good idea, but some casinos that provide this game don't get many players interested in trying it, maybe because opponents are not always available because this is what I have experienced when playing games on mobile applications, sometimes there are no players available to play with, but from all that, I hope that your game development can run smoothly and provide something different from other casinos so that there will be many players who are interested in playing
This has been the problem of many games, theres no enough players and most of the time gamblers dont want to spend that much time waiting for the result of the game because gamblers wants an instant result. OP should start considering to still offer other gambling games to give the gamblers an option as well but if they really want to focus on this, I think this must be unique so they can attract more gamblers on their platform.
But it's okay if the OP wants to launch a casino like that PvP game because maybe the competition isn't too heavy compared to making casinos that have games as usual. But we can suggest that the OP have the usual games available in many casinos, so this can also be an attraction in his casino. And as long as OP can receive input from many parties and start thinking about the shape of his casino, I think he can make something different from other casinos. We're also still waiting for comments from the OP on all the advice we've given him.