It's not as fun as agar.io in my opinion. The biggest problem is the balance in this game: in agar.io big players are discouraged from attacking small players, they're too slow to catch them and the risk of splitting is not worth it. It's incredibly easy to attack a smaller ship in this game and there is no risk.
The mutual destruction in this game is an annoying mechanic in this game, yet you keep shooting at players with a similar size as there is a chance they wont react quickly enough.
It looks incredibly cool, but it needs some more balancing to be as fun as agar.io.