After only having played through the first world I can still honestly say this is one of the most enjoyable and at the same time addicting platformers I have ever played.
The game has the same feel to it as some of the stages in "rayman legends", when it comes to combining a lovely soundtrack with gameplay. Running through the stages feels great! Although it sometimes creates a frustration repeating the same sections over and over again, the satisfaction when you actually manage to make it through a difficult course, more than makes up for it.
I spent 10bucks on the nintendo eshop, and I got my moneys well worth! If you haven´t played it yet, check it out!