I would like to know the ending is one at the time only? As I catch 3 big prizes (the devil plush, pup mask and game console) at a round but only one scene shown at last.
You can only see one ending per run, but the game keeps track of which endings you have seen, so it'll keep spawning the prizes that correspond to endings you haven't seen at a higher rate, and it'll always show you an ending you haven't seen yet if it can.
You can also click "Retire" after getting a prize with an ending you want to see, to save time. The run ends but endings still play.