Getting all the upgrades up to the 99999 exp limit...now that was awesome. Then beating the boss with the maxed out total combination, that was even more awesome and spectacular
That moment when you beat his human form with either the red or yellow upgraded armor, then realize he has a skull final form, then get to the pink lollypop-wielding upgraded armor and killing him off with two lives remaining...epicness
Never hitting a red: "Super Duper". Really, couldn't have worded that better? ...all right. An amazing game and better than the prequel. As a musician, I give it bonus points for calming and adequate songs.
Pick the Balanced tanks up until the 4th upgrade, then pick Heavy. The seeker fighters for the final upgrade will make it near impossible to kill off in the end.
The marine biologist part of me enjoys seeing games that deal with marine life. Having said that, at 50 meters, the moon would impact the Earth very quickly and very strongly. The last thing that dolphin would see would be a gigantic rock floating right into its oceans and destroying the planet. Other than that, the game is magnificent. 5/5
Following everyone's suggestions and ideas and such, getting all the badges was much easier now than it was when I first played it when the game first came out. Sequel is definitely much better than the original in nearly all aspects.