У вашего броузера проблема в совместимости с HTML5
Oh my god... I can't believe I pulled this off. Anyway, here is a 100SS replay of me completing the Yukari Yakumo stage and battle while collecting all 100 stars, and not dying in the process.
This is an absolutely brutal battle to pull off. First, being able to collect all 100 stars in the stage portion reliably took me over an hour. Just beating the battle took me another 2 hours, and then figuring out how to dodge the imitation of danmaku bounded field, as well as doing the first part of the battle with enough hits to spare, took at least another 6 hours.
I'd added some annotations. They were made in HD mode, but they should look fine if you're not watching in HD.