Ive had the pleasure of playing this yesterday and it was awesome. Great graphics, tight controls, superb sounds.
The controls may be awkward at first, but it'll come naturally as you play along. There are 3 lanes to run on, swiping left or right moves you one lane into that direction. Staying on the left lane will make oyu turn left, staying on the right will make you turn right. There are shooting sequences where you need to tap on screen to fire your weapon. Upgrades are easily farmed for, but the consumables are very expensive.
The bad is that it requires facebook to login to leaderboards, and the app posts for you automatically, which is quite annoying. Im not sure if it posts every after a game, or everytime you beat your highest score. Ive had over 10 auto0posts in my facebook account in which friends and work colleagues asked me about them which is uncool. For now ive just turned off FB integration and enjoying the game, even without a leaderboard.
The game's stellar, but the FB felt a little too intrusive.