If you care to expand this game, I have some ideas:
Pink blob falls upwards.
Gray blob can morph into other blobs but cannot morph again.
Striped blobs are hybrid blobs that combine two different blobs but not if both are gravity-based.
Thank you for the suggestions.I though about some of these as well but found that they had weird implications that I did not like.But I do not intend to create more puzzles for now.