Surprisingly addictive, considering the subject of the game and simple gameplay.
The basic aim is to just run as your rainbow Unicorn and destroy what look like giant crystal stars with your rainbow attack. That's literally it, only two buttons control this game and the only intsruction was 'press Z to make your dreams come true', which really, has to be one of the best game instructions I have ever recieved.
You can really go into a sort of trance playing this game which is helped along by the background music which is incredibly cheesy, but like the entire game it works well. The gameplay is very smooth and functions well which is I think why so many people like this one.
Overall this is obviously mindless flash-game or phone entertainment but unlike a lot of them this one is actually entertaining.