We should be able to keep the powerups we get in a level and don't have time to detonate, only on levels you don't win. So if you beat the level, the bombs detonate and you get more coins. But if you lose the level, you should keep any bombs, etc that you have on your board still or they should detonate to give you a chance to maybe clear the board. I like the idea of keeping them better. I have been stuck on level 49 forEVER.