I,ve been working on a new game for a couple of days now and I was wondering: Does Quest have the ability to play games online (PVP) and if so, how and does it work if I swithched it to an app later?

Somewhere along the line, KV had shared with me a split screen WIP that allowed players to share (sort of) one game at the same time. I think it would be quiet difficult to make Quest do what you are asking. As far as converting .quest into an app... I'm not sure many people have had luck with that. Perhaps someone will come along with better news?

Your best bet would to use a different platform for PvP games. I can't see this as a text game...
IE:
"You enter the bar, and see, Player 1, Player 2 and Player 3 at the bar having a drink. Player 4 and player 5 playing foosball.
Player 6 enters the bar behind you, shoving you out of the way...
(You wonder if he is trying to pick a fight with you.)"

Maybe a moderated chatroom could fit in...

Yeah I'm not sure if you can have PvP. Maybe, but I doubt it. If anybody does figure out how to have multiplayer (PvP or otherwise) let me know, that'd be pretty cool.