Thank you for your comment!
Blobs will always try to go in the direction of their home planet, but left clicking anywhere on the screen will make them curious (only for a few seconds). That way, you can attract them manually.
Not sure if we are talking about the same bug, but we noticed in that final build that sometimes, blobs are moving very very fast from a point to another, like flashing. Didn't have time to investigate on this yet... Sorry! =)