This game is absolutely amazing and one of the best I have played in a long time. The premise of the game is that the universe is being torn apart, and there are rifts all over each level which, as you enter them, lead to a different world, which turns you into a different hero with totally different powers.
The 5 characters you play as are a knight, which is very similar to super mario, a ninja, complete with a sword, double jumps and wall hangs, a space ship which leads way into shmup style levels, a little bull thing that plays like pac-man and an astronaut who has a jetpack but no means of attack.
Individually all 5 styles are handled well, the controls for each character are very tight and I never once blamed a death on the controls. Each character, on its own, is very fun to play, but where this game shines is the way the characters are integrated into one anothers level. You may think it is just a gimmick, but the reality is that the way the genres cross each other is brilliant and the further you get into the game, the more wild the cross overs become.
The difficulty curve in this game is handled extremely well, this is not an easy game, and you will die a lot but the difficulty progression is very smooth. The game starts out easy enough as you play a few introductory levels to learn the characters and as you progress the levels and the cross-overs between them get increasingly more challenging, but you never feel overhwhelmed, nor do you feel that anything is cheap. The beauty of this game is that some things will seem insurmountable when you firts look at them but before you know it you are completing insane challenges like a pro.
There are also 3-4 gems in each level, very similar to the 3 big coins in the new super mario series. SOme gems are right in your face but tricky to access and others are cleverly hidden, obtaining all these gems is important to the story, but more importantly you will have a blast trying to collect all of them. This game is also sprinkled with some humorous moments that pays homage to some old games, be sure to read the titles to every level. The story here is also well done, it is a platformer so don't expect anything crazy but there is more of a story than your average mario clone and even a funny little twist that I will not spoil for you here.
I cannot recommend this game strongly enough, if you are a gamer you owe it to yourself to give it a try, it is unlike anything you have ever played or probably ever will play. It is an absolute blast from start to finish and I cannot think of a single thing in this game to complain about.