Good, could be better
This is the kind of game one plays only for the medals, and this is not a good thing.
It is an interesting twist over the classical "avoid this colour" catch game, since you can actually choose your own color. However, it becomes boring in less that a few minutes, and lacks of replay value.
Maybe add a level system, some power ups... As it is, it's more an exercise that a real game.
Overall: 7/10 for the idea and the effort.