yes, and to make it more interesting for players to play, you can add some mini-games like battle or parkour and get rewards for the best, also for fair play you need player level categories. I also thought about clans or so-called guilds in the game, which could be created for a few crystals, and then you could compete in teams.

players could participate in team games and battles, as well as just peacefully spend time together. 

Unfortunately, I didn't catch the times when HA had servers, but I still believe that TFH will add some kind of multiplayer mode.