A mini-game is included to smartphone version of the Minion Rush game. Go to Options > Gift icon.
By selecting the right combinations for the minions you can unlock on the following bonuses:
Kung Fu taunt
X5 banana perks
X5 score perks
To progress in the game, do not hesitate to repeat the same level several times, even if you've already cleared them. This will help you to accumulate resources quickly and thus unlock upgrades or costumes for your minions.
Login to the Facebook page of the game to get additional bonuses.