The main reason is that it was way too close to the game Strike Suit Zero, and the character’s names are all based on space-related objects (Comet, Asteroid and Meteor) so it made sense for the team’s name to reflect that. I also really like the word Nebula. Zero has been done a lot (Blaster Master Zero, Star Fox Zero, Mega Man Zero, etc.)
So yeah. I hope you like the new name and logo. I am very happy with this logo compared to the old one, but feedback from others is always welcome and is very important to me when it comes to the development of my game.