Well, that's it, basically! I found a new host and now the Proun server is back online. This one is a lot more expensive and a lot more scalable, so I can only hope it is going to survive the large amounts of traffic Proun is getting! I know too little about hosting to really be sure, but people who do know stuff advised this one to me.
Right now just over one score per second is being submitted to the highscore server, so lets see what happens if that increases!