This game seems simple at first, but is actually very challenging. For players who want to be the best, it is also complicated because you have to balance speed with taking time out to gather extra items. So far, I have only played through the first world, but the first boss seemed rather easy and simple compared to the rest of the game. I would have preferred a slightly harder boss. The medals you earn are pretty typical. I personally really like to earn medals and the like, but all of the medals in this game will probably be earned from just a single play-through of the game; there aren't any towards which you specifically have to work. Good animation, fault allowance, and core idea; I'll be looking forward to finishing the game!