I kind of forgot that I owned this game, and I guess that probably should tell you all something.
Not even going to go into what kind of game this is - if you're on the store page at all, you know what you're here to buy, and in all honesty, Runner 2 is not what you're here to buy. Like me, you were probably expecting BIT.TRIP RUNNER, but with fancy graphics... and at its core, it is indeed BIT.TRIP RUNNER with fancy graphics. Only at its core.
A lot of complaints in the negative reviews are complaints that seem to suggest the player just doesn't like this kind of game. If you truly are new to the scene of BIT.TRIP, it's a rhythm game that integrates what you're doing with the background music, and you're technically supposed to be able to use the audio cues to help you improve your gameplay, but that seems to have gotten lost here. The first RUNNER title was a huge leap away from the previous trilogy of BIT.TRIP games, and remained simple to pick up but challenging to master. Your movement options were essentially limited to run (which the game does for you), jump, and crouch/slide. That was it, not hard to manage.
With Runner 2, the game just dumps features on you. You can jump, you can couch, you can kick ♥♥♥♥ apart, you can bring up your shield and bounce squares around in homage to the first BIT.TRIP trilogy... it becomes overwhelming and a little unintuitive. Maybe the dev team changed, but it almost feels like they forgot what they were doing, most importantly, forgot the difference between the depth of gameplay and the complexity of gameplay. With limited, almost one handed controls, RUNNER was able to match the feel of classic games upon which it was clearly based. Runner 2 on the other hand tries to make itself challenging and give itself more depth through the use of new mechanics, and stacking those mechanics on top of each other, and it starts to become like trying to pilot a jet - there's a ton of buttons and it's almost impossible to remember on the fly which one is doing what and which one needs to be used to stop yourself from crashing into whatever is in front of you.
Story wise, it's nothing special. This is one of those games with a story that just doesn't really need a story. No one cares what's going on here.
Overall, the game sums up to just that: a game with a ton of stuff no one really needed. The developers could have cut down on costs by ignoring the story or all of the weird, sometimes surreal semi-comedy, and paying Charles Martinet of all people to do announcer voices, and then passed those savings on to the consumer to bring a reasonably priced automatic runner out instead of a 15 dollar title that only manages to be enjoyable because of the eye candy.