* DemonicSpiders:
** Literal ones in "Reptiles". These come in huge numbers, fire volleys of {{Spread Shot}}s, and have a very good amount of health. Worse still, they swing about, causing easy CollisionDamage. And there's also a giant tortoise to annoy you when you face them.
** The rockets in "Catastrophe" constitute an instance of BulletHell, considering your Eater's large hitbox. They come in large numbers and -- once again -- shoot an 8-way SpreadShot frequently. If you don't eat them and their shots, your Eater will get overwhelmed.
* FridgeBrilliance: Using your "eat" move on the nuclear reactor boss gives you the "mutation" ability. What can radiation cause in organic creatures, again?
* GoodBadBugs: It's possible to repeatedly eat the two small, grounded humans without them dying, as long as you bite them at point-blank range. This allows you to get back a lot of health in a level where health food is scarce, as well as getting a good end-of-level bonus.
* ThatOneAttack: The lightning attack used by the final boss covers the whole screen, has narrow gaps to squeeze in-between and strikes ''twice''. The good news is that it can be weakened by destroying his horns and disabled by destroying both, since they execute the attack.
* ThatOneBoss: The MiniBoss of the final level, "Catastrophe". You have to fight against a space shuttle, which isn't dangerous in itself- it's pretty large and vulnerable and doesn't even attack. However, [[FlunkyBoss it's accompanied by]] laser bolt drones and the above-mentioned spreadshot-spamming missiles, and the latter will make the fight especially hellish.
* ThatOneLevel: The final level, "Catastrophe" contains [[http://bbh.marpirc.net/chimerabeast/cb7.png loads of laser bolts and spreadshot-shooting rockets]] that will make life '''hell''' for your Eater.