The following enemies will be encountered.

Enemy	How to unlock
Blue spikes	Fast moving, and will turn invisible if they are at a distance. Make them reappear by establishing an absorption link with them.
Purple crosses	Split into smaller versions when absorbed. The smaller versions are absorbed very quickly and are not a threat.
Red circles	Bombs that require more time to absorb than teal squares. While absorbing them, a white circle will appear to indicated their blast radius. When fully absorb them, anything caught in the blast will be destroyed.
Teal squares	Normal enemies with no special features. They will drop down onto you. You can dodge and absorb them easily.
Yellow triangles	Will form line shields when close to each other. If there are more than three triangles on the level this cause a dangerous situation that limits your space. Take them out quickly to prevent this from happening.