The graphical style of the game is phenomenal, from the 'cardboard' children to the user interface, pastel colour theme, everything just fits perfectly. The concept of the gameplay is simple but its a real rush when the herd size starts to snowball! Even so a huge herd can quickly be decimated which keeps the game tense until the last moment, very nicely made! In terms of complexity, it would definitely be cool if the different coloured piñatas somehow behaved in different ways (which isn't the case currently unless I am mistaken?) to really add to the chaos (they could eg. interact with each other in different ways).
Steering was a little bit difficult (not sure if that was a design choice or not to make things a bit more frantic) but it took a while to get used to the movement of the piñatas. The music was serviceable but got a little bit repetitive quickly, so would have been nice to mix it up a bit somehow.
The latter are minor points though and my overall impression is of a charming and fun game!