LETS GOOOO congrats on beating the game! I also have thousands of hours and in ROTMG funnily enough haha happy to see another realm player here!
I wanted to make the game challenging but fair and not tooo hard; each phase was designed with the intention of being no-hittable. Unfortunately the game sometimes lags and stacks shots from multiple beats leading up to situations like the one in your last screenshot, this bug seems to be more prevalent on web and doesn't happen in engine making it hard to debug :').
Thanks for the feedback and hope you enjoyed the experience!