What can I buy with my coins?

You can use coins for obtaining a variety of different things in the game. You can easily use them to buy Boosters when entering a level. 

Coins can also be used when you run out of moves on a level and will give you a handful of extra moves. This is a great option when you only need another couple of moves to win a level. 

Additionally, coins can be used to refill your lives when you run out.