This game is good. Level design doesn't have nearly as many as those instant death traps as Sonic Rush (though a few still show their face on occasion), and I generally felt like I was doing more than just boosting my way until the end. I don't think the wisps really helped with that though, Drill and Void are the only ones somewhat interesting the rest are just annoying to use to me. Game is very short, only containing around 12 levels but ranking system + extra missions can offer more game time if you want it. Visually I think game looks great and the soundtrack is even better, seriously the soundtrack is really really good.
Recommended if you enjoyed either Sonic Rush titles (this game is essentially the third anyways), or just want a high speeds platformer.