Phenomenal action-platformer! I've had a blast playing it, the level design is brilliant, and I really enjoyed the heart-collecting and shadow-racing challenges that came after beating the game, added another level of difficulty and fun to the various levels ^_^
I also love the unlockable characters, I've used the green panda to complete the heart challenge, pink bear for the shadow race and the shadow bear for the remaining challenges. It'd be cool if there were more, but the ones which are at disposal are great! ^_^
By the way, here's a tip for getting the "The Floor Is Lava" medal: you can only "type" the konami code in once your cursor changes into the type cursor, the normal & hover cursor won't work.
Despite many people complaining in the reviews about the game's difficulty and gameplay, I adored its design. The difficulty was rather high, Super Meat Boy-ish kind of level of difficulty but still quite manageable with just twenty levels and I really like how the simple game mechanics have to be used to progress. The "hidden" shortcuts in levels 7 & 15 were also a nice touch on the level design aspect, you're unlikely to stumble on them, but for ones who do know of them, they have a slight advantage :^)
Overall, I've greatly enjoyed the game experience as a whole. The soundtrack was amazing, I like how it changed every game mode, the achievements werent too obscurely difficult (though, I'm warning you, those aren't easy-peasy medals) and the fun factor was high. Thank you for having developed such an amazing game for the Newgrounds audience to play! ;D