* CrowningMusicOfAwesome: Some of the soundtrack in the game is rather amazing.
* DemonicSpiders:''Psychosquid.'' (aka the Type-P alien) It has very high health, moves faster than all of the aliens, eats multiple fish at once, and after some time, he goes into a defensive mode where he regains health if you shoot him.
** Iit gets worse when in tank 4, it attacks alongside Balrog.
** The Type-D alien, AKA Destructor, can be this for first-time players. [[GuideDangIt There's no indication you can shoot the missiles it launches]], and even all the offensive pets plus a max weapon can't kill it before it launches a round of missiles. So you'll be spending a lot of money to replace your fish before you learn how to destroy the missiles.
* GoddamnedBats: All of the aliens unless you have Blip, since their attacks locations are unpredictable
* TearJerker: The end credits song,[[http://www.youtube.com/watch?v=w9scA_0ZKbY Lullaby]].It's just so beautiful...