Thank you for the comment ^^ I tried my best to mix rythm and bullethell as it was something I really wanted to do for a while and never started. The proper song is Scarab yeah, but it's not finished, sinchronizing the bullets to the music is really difficult and more time consuming than I expected, but I'm glad you liked it.
As you say, the window on that frame is too small, however if you hit the key exactly when the beat does, you don't get hit. I considered it as a minor issue to solve, because it was either that or too much room, but I have to tweak that, thank you for pointing that out ^^