Bought ZooZooGo. It has 3 minigames in it.
Concerning the match-3 game, my quick comparison to ToMB:
-It's not free
-Overall theme obviously
-Different gameplay: you don't swap tiles, but move full columns or rows
-ToMB can be much more crazy
-Visuals on ZZG are cute and crisp and animals have small animations and sounds.
-There is no hint button: this is a plus, as it adds tension
-There are some additions that require you to think slightly differently (rocks, glass, ...)
-IAPs are optional (as in ToMB)
-Some animals are intentionally very similar in colour.
-There are some powerups, of which you can use 4 per game, and add more with coins.
Conclusion: if you like match-3 games, want to try a new formula, and animals theme doesn-t act as a deterrent for you, then ZZG is a no brainer.
Mah-Jong:
-Standard mahjong solitaire
-Curiously, here you can play much more quickly than your average Mahjong Solitaire.
-There are also powerups