First of all, thanks for the appreciation.
Some can me more tricky then others. If you want some suggestions...
13. It's something that would be a bug in most games, here it is a feature. The ball has to "ascend" vertically
14. The level is meat to be really hard, and it is really frustrating (Sans...) and you can use your rewind ability freely. The difficult part is to know where to place all the Rewind Points so you can avoid certain death. There is a "cheat" mode, if you want just to see the fight play out and listen to that gorgeous music. If you want to know how to access it, just reply to this message