I reviewed the website you sent. I can do this with my teammate. Can you send me telegram or whatsapp for fast communication?
You said this so lightly, that it seems amateurish to me. Do you have any idea how many things are happening in the background of the jamler.io site? There are serious reasons why we don't currently have a flood of similar services, one of which is that its coding is not a game
If I understand correctly, OP and his team are front end developers, with some experience with WordPress, plug-ins, etc
Have that in mind @digaran.
Building templates is something much different than building a complex software, with API, databases, backend, etc
He didn't mentioned the skills necessary for this kind of job in the OP.
I am not saying he can't do. He just didn't presented himself as capable of this by looking at op.