Thanks for playing! The feedback is a great confidence boost. Nice job on reaching level 8, I never made it past that either.
I did want to add some sort of dash indicator but decided to work on the level saving instead as I was running out of time but I totally agree its quite confusing and hard to tell when its off CD otherwise.
It is an endless game so you didn't miss any hidden content. The number of white circles will just keep increasing each level ... probably until the screen fills up and you can't move anymore :D