I seem to be stuck on the 8th level of plant 3 with the starfish aliens, I'm able to get to the basement and have the alien kill the guy there, but get stuck after moving one of the boxes up. Is this a bug? or what is the solution?
The one thing that confused me about your comment is the fact that there aren't boxes in that level. If you mean you got stuck because of where an egg got pushed, you should try some other movement patterns for the eggs because the level does have a solution.