Thank you very much for the explanation! I gave it another try! The problem was that at the shop, when I first opened it, there was only powerups, and not a single "shoot I" or "shoot II". Maybe, as a suggestion, if you improve the game further, you could make sure that the first shop will always have at least one "shoot I", because I had to re-roll the shop a cuple of times to get the item, witch is only a problem if you are playing the game for the first time xP