Loved it, It took me about 5 times. Each time I reached the boss I came across a new issue. First attempt I didn't have enough coins. The next I didn't pay attention to the other enemies, etc. The most worth while upgrade are things to do with going up. Wall jump>double jump>high jump>no_fall..... those were the most noteworthy, the rest i never bothered to purchase. Anywhoozal, good game mate.