It's a simple, yet nice experience ^^
There's not a lot to do in the game, but it's what makes its charm. You get attached to these little creatures, I always frowned a bit when one group disappeared :c
It may lacks a counter to know exactly how much of each creature you have, because it's a bit tedious to keep the numbers at all times. But it still works fine without since 10 isn't a really that high. (30 is more complicated though ^^')
The art style and little illustrations are great! Nothing to say on that point, it gives this game a very unique identity. With a bit of music, that would have been perfect!
Good submission! =)