hahaha :)) Hello ! <3 thank you for playing, well done beating it !
now regarding the "glitch" ... well ... sorry, for once this is not a bug, just bad game design I guess XD
as this is the final boss, well, he has ability to annoy you rotating the screen ... I know, this is cheap and silly :) Also this is the only level where the ball can stay up, out of screen, but don't worry it will always get back to the ground :p
it's confusing but... I love to see people getting mad for awhile when encountering the boss. The brain doesn't like losing the ball from sight, and even less seeing gravity through a rotated screen :) I would say this tries to fill a lake of better gameplay design to be honest, but on the other hand I really find funny that people take it as a glitch but still manage to beat it ! Thanks a lot for playing and for your feedback, If you felt like this was a bug and still beat it, I could consider that it's "working as expected" !<3