The game mode is called Battle Royale which is comparable to Survival Games and UHC. It's different, though. This game mode will get notable favourite at first, but I assume the game mode will quickly get unpopular/die as other servers came up with the idea first and might've executed it better. I am aware Cubecraft can give excellent twists to every game but still, this game is unsuitable for Minecraft in my opinion.
A few more classic UHC game modes will be cool, but as you might've noticed, UHC is really unpopular at the moment. Always in for a good UHC update so yes!