Reading the rules we see the following:

 "It's highly advised you create new content for the jam - submitting your old demos or already finished projects makes no sense."

I completely agree that submiting projects that have already been made, kinda breaks the two weeks restriction, which is what makes a jam fun for the most part, but I disagree that there's "no sense" in submiting old projects and I'll explain why.

I have made an entire online RPG with pure typescript, directly accessing HTML 5's canvas API for the graphics and using default document selectors for inventory, chat, dialogs, etc. No libs, no frameworks, just raw web. It took me quite an effort to pull it off. The server is pure Deno, running on Heroku, also typescript.

Why am I telling this? To explain why it makes some sense to submit old projects: visibility. I have a tiny player base of an average of 5 players everyday, but I really wish more people were aware of this work, maybe even become players and I think submiting a finished project is one way of sharing what you came up with.

So, summing it all up. Is it allowed or not, and should old projects be submited or not to the jam?

Since "...highly advised you create new content..." this sentence does not make it very clear. And "...makes no sense." this sentence has been addressed.

Thank you all very much!

Thanks for asking - yes, it states "highly advised" and not "mandatory". I totally understand your point, but on the other hand it's a jam which will have its own given theme, and a bunch of prizes, so adding your RPG right when the jam starts and not even matching the theme would be considered a spam and the game will be removed immediately.

Maybe during those 13 days, you could create a small hyper casual (demo-like if needed) creation from scratch (incorporating the theme) that would invite folks to try the "full" RPG? It would make more sense in a way that it could end up higher in the rankings and actually get a lot more attention and traffic to your big project than just throwing it in on the list and calling it done, ultimately ending at the bottom of the rankings.

That's actually an amazing idea, thank you very much for your response and sugestion!

Awesome to hear that, good luck then!