Pink goo is found in nearly all levels of Rockitty. If Rockitty is shot towards and touches it, Rockitty will stick to it. Pink goo is found mostly on walls and around planets.
The player can use it to immediately stop moving, since there is no other way to stop themselves. Only Rockitty can interact with pink goo. Enemies, hazards, or other objects cannot interact with it, and will simply act like it is a normal wall.