On the way you can collect coins to unlock more characters, or you can buy them to (about 80cent)
From 100 Coins you get a gift that is also quite fast, have after 20 minutes playing time already 5 different in the collection, this is huge and each character has their own little character also on the environmental impact (Alien: Night mode or chicken with Christmas hat: Snow World)
The design like it very much
really fun