* BreatherBoss: ''Bangai-O'' has scads of these, usually consisting of green orbs..Whose only mode of defense is [[WhatKindOfLamePowerIsHeartAnyway regenerating health]]. Of course, they do tend to be found at the end of [[ThatOneLevel rather difficult levels]].
* DemonicSpiders: The higher-tier bots in ''Spirits''. [=FastBots=] roll around in their impenetrable armor at you to damage you, then open up to hit you. [=NinjaBots=] fly around at high speed, blocking your shots with their sword, which they also use to cut you up. [=BigBots=] fly around slowly, but can reflect your shots back at you, and swipe you for massive damage. And finally, there's [[BossInMookClothing Longai-O]], who can use EX attacks just like Bangai-O can [[TheComputerIsACheatingBastard but without any pretense of a limit to it]].
** Some of these are, thankfully, cakewalk in ''Missile Fury'', especially when you have access to both dash AND freeze.
* FountainOfMemes: Even though the first entry is a potential untapped source, this is averted by virtue of the game's obscurity.
* {{Moe}}: Mami. This is emphasized in the game over screen shown [[GuiltBasedGaming when you refuse to continue]].
* ScrappyMechanic: In order to give custom levels to other people, ''Spirits'' will turn the level into a sound clip, which is then played through the speakers. A lot of people have trouble getting the DS to recognize the sound clips unless their set-up is absolutely perfect.