I had a lot of fun playing this! I made it to Ultimate Bounce before giving up. The levels were very well designed and the concept is really good. I did find myself getting frustrated at several places, but the levels were short enough that it fueled me to keep going. After seeing Ultimate Bounce, it seemed too long for me to continue.
I also found myself often missing my timing because I had trouble creating a number of bullets then switching to the platforming. I would try to create five bullets, but then the first bullet hit before I could move the platypus. I really liked how quick it was to restart, but it sometimes felt a little frustrating waiting for the bullets to get across the screen before I could start the platforming; the waiting killed the pace. That being said, I can't think of a different way to do it.
This is a neat concept and really well implemented. Well done!