Good game mechanics, it's really enjoyable to see the evolution of a minion group forgoten on the part of the map, but I feel the game not hard or easy, just random.
Sometimes the map is too tiny to allow me to split the groups in half or build a strategy, I just gather my whole group unwillingly.
Game concept is god, game art is good, music also. Too bad that the gameplay is enjoyable because simple and clean but ruinned by the many tries of some level, praying to have some good evolution or my minions to lay an egg.