Hi TailorGhost, you are right, in the easiest levels its more intuitive to complete it with only one character, but as you progress in some of the levels they are build in a way that makes more sense to clear one side with one player and the other side of the level with the other player. Just like in a real Symbiosis, both parts dont always bring the same effort.
But yes a 2 player co-op or online multiplayer would have been ideal if I had more time and more experience xD