Fleas

Fleas are extremely weak and small enemies which cannot directly harm you. They move around by jumping and by climbing walls, but some are better at this than others due to their random stats. Fleas are mostly dangerous due to their ability to disrupt your movement so more dangerous foes have an easier time striking true. The most basic flea has a blue head. It will try to jump over your head and then stomp you into the ground. If it crushes you into another surface you will take a small amount of damage. This damage is easily avoided by jumping. Any type of damage will destroy this flea.

The next level of flea has a teal head. These will initially fire basic bullet types, but at later levels they will fire homing-type bullets. Any type of damage will transform them into blue fleas.

The next level of fleas are the purple types. They will fire mine-type bullets and will turn into teal-headed fleas upon taking any damage. Purple-type fleas will randomly teleport near the player at regular intervals. They cannot be escaped. In the very late game are the white fleas. They will surround you and then freeze themselves when they are close enough. When frozen they cannot be killed and touching them will prevent you from using portals and stop your hover pack from restoring its fuel supply. They are turned into teal-type fleas when they take damage.

If you go into Blue mode, then white fleas will become red fleas for the duration. Their behavior is the same, but if you touch them your weapons will be disabled for one second and you'll be knocked out of Blue mode. Red fleas cannot be killed by the Brain Bomb Decrypter.