Update sent to the App Store

I uploaded an update of PewPew. From what I read, it will probably take a week or so for the game to be available on the App Store.
Anyway, PewPew now:

• encourages doing the tutorial when playing the game for the first time
• asks for confirmation when quitting a game
• permits the activation/deactivation of rotation during a replay
  
• makes it visually obvious to the player that he has taken a bonus
  
• has a lower amount of particles
  
• has prettier explosions
• puts the game in pause when a low battery alert (or a music menu pop up) appears
  
• ignores replays that can no longer be played
• make the difficulty increase more slowly in the "Assault" mode
• respects the players that are listening to their own music :)
  

Under the hood updates:

• versioning system for the scores
• precalculation of the explosions
• needed models are loaded at the beginning of a game (to avoid ingame slowdowns)
• externalized descriptions of the game modes

What I should have finished:

• The 3rd mode
• An obvious optimization to the collision detection

I am still not satisfied with the way the "3rd mode" is. I have tried a variety of gameplay models, but I can't find anything that's not too hard and not too boring.
Also, the "obvious optimization" will take a lot of time to do, and right now I prefer focusing on finishing the "3rd mode".