Just made this account 'cause I'm going crazy trying to find out the name of this game. Please, help me!
It's a platform game, almost sure it's 2D. The character (can't remember if it's a person, animal, alien or whatever) had to walk through the scenario collecting these little monsters, aliens, creatures or whatever they were. Then, as long as you were collecting them, they walk behind you in line, until you take them to this determined space, and let them there and go for the others. The stage ended when you collected all the creatures of it. This makes any sense? Hahaha.
Come on, someone's gotta played this!!
Oh, and sorry for the terrible english, I'm brazilian.