You have 2 ways of playing this game, 1. You play without thinking in the flowers or the red coins: Great experience, a lot of variety in the levels and bosses that are fun, not hard by any means, but fun. 2. You try to get all the items in a level: An extremely annoying experience, the game doesn't save anything after the checkpoints, so if you lose a live, you have to do a lot again, plus the fact that most times you are gonna died in one hit (Spikes, lava or voids) and you get a really discouraging experience.
Everything else is excellent, even if a wish that it has more music.