Angel Cat Sugar is a simple platform game with nice use of colour and characters for children to enjoy. There are various areas to explore, each with unique collectables (similar to coins in other platform games) which unlock things for every 100 you gain in that area. Each area also has mini quests where characters ask for your help to do simple tasks. The main objective is to rescue Angel Cat Sugar's little fairy friends and stop the storm cloud which has been causing mischief.
I bought this game for my little sister and she seems to really enjoy it. I had a go at playing it myself and it's actually quite fun. It's perfect for younger children to play on the DS; it's quite simple and easy to play since it only utilises simple controls. Jump/Fly and directional buttons. The game contains "enemies" which you have to jump over to get past, you can't "kill" enemies as it were and it's actually not possible to "lose a life" as you do in most platform games, instead if Angel Cat Sugar collides with an "enemy" she stops moving for a second and giggles. While this doesn't promote any negative emotions that some may find inappropriate for younger children, it doesn't really teach the fundaments of gameplay either; not everyone is a winner and losing is necessary for growth. It's up to you what your opinion is on this matter, however.
Overall it's a cutesy game for young children and it's similar to Hello Kitty. I'd wager if the child likes Hello Kitty, this would be enjoyed as well.
(Note this is not the same as Hello Kitty, neither is it a product of Sanrio. It is a slightly similar character from the original creator of Hello Kitty, Yuko Shimizu who retired from Sanrio in 1976.)