Fun game, but takes a while to get used to. Its a runner-style game, but with much more action per second, and some variety of levels and actions performed (including, but not limited to: riding bikes, cars, jetpack, unicycle, fighting bosses, surviving bosses, time attack levels ect). Controls are hard at first (jump, duck, fly down - all on one button, Space, quite unusual), may work better with a controller (I have one, but have a hard time using it, I'm a keyboard person).
Most of the game (about 80% of all levels) are quite doable and fun. Last few levels (Director's cut) are a nightmare. Timing required is insanely precise, and controls don't always work the way they're supposed to (or so it seems). Retrying doesn't take much time, which is good.
Game play is repetitive, level pieces start repeating over time. You can help this by making your own levels, or downloading community-made levels (and uploading yours).
Music is good. The mood of the game is good. Some achievements are quite hard, but I'm sure its all doable (some require DLC, though).
Recommended for fun. Same-screen multiplayer is available, most of the game is nice and fun.