Fly, Evo! Fly! is a secret level unlocked after collecting all souvenirs. The level is also available in the PlayStation version after clearing Punch-Up Pyramid.
It is said that collecting all souvenirs will unlock this level, which makes you get a hundred percent. However, there is a glitch in Fat Bear Mountain that the faucet is invisible to get, so you can't get a 100%.
This is just an endless level. There's lots of asteroids which are enemies. If they are shot, they will turn into bits. After a wave of enemies are dead, there are more tougher enemies. Some enemies, such as spaceships will shoot bullets, while others such as starships will also shoot. Power cells upgrade the ship. If an object hits the ship, it will lose its power up. If the ship is hit three times, the game is over.