I was just wandering around browsing some maps and I found some stuff that needs to be polished/changed before ranking this, I'll point only the major issues I could find.
[General]
As Irreversible said, the correct title of the song is
FlashBack, with the letter B capitalized, as it's stated in the video of this song, see image below in spoilerbox.
You must change this.[Normal]
I find AR 3 too slow for this song, I know this is the lowest diff, but having too slow AR makes many objects appear in the screen and a beginner would likely scream in despair and click as fast as possible (not really, but something similar), increase it at least by 1. Also HP Drain and OD 2, this is not an Easy right? increase both by 1, if you're afraid about star rating, it will just increase to 3.07, which is still accepted imo.
By that you will make a better spread in your difficulties, HP goes 3>5>8 and OD goes 3>5>7
03:12:183 (1) - Not necessary but maybe put NC in this spinner?
[Insane]
I find this pretty overmapped in some streams, I'll just point those who bothered me while playing, don't want to bee too picky, and other some suggestions here.
00:37:399 (1,2,3,4,5) - Delete the circles in blue ticks, it's a bit jarring hitting this as there's nothing in the music that makes it intuitive in my opinion
00:42:507 - A circle could fit here very nice with the drums, you really should add it.
00:52:480 - This definitely will sound and play better here, try it, it's a bit weird as you have now as the stream goes before the one that should be in drums.
00:57:832 (1,2,3,4,5) - As I said in the first suggestion for this, delete the objects in blue ticks.
01:52:318 (1,2,3,4,5,6,7) - This part could be very fun to play if following vocals, so delete objects in blue ticks.
02:02:697 (1,2,3,4,5,6,7,8,1) - Same reason as above, but in this case just delete (2,4,6)
02:34:156 (1,2,3) - You should know what I'm going to say for this.
02:36:751 (1,2,3,4,5) - Same for here.
02:44:859 (1) - I find the hitsound for this slider a bit annoying, but I think nobody else mentioned this, so I'll leave this to you to consider.
02:50:697 (1,2,3,4,5,6,7,8,9) - As I said in 02:02:697, just delete (2,4,6)
03:01:075 (1,2,3,4,5,6,7) - Delete overmapped objects.
03:06:102 (1,2,3,4,5,6,7) - Same here.
03:08:697 (1,2,3,4,5,6,7) - And here.
03:12:183 (1) - Not necessary but maybe put NC in this spinner?
I passed some triples here, but you should know that many of them are overmapped too, but I'll leave it to you, as it's not a big issue in comparison with all I mentioned above.
If you decide to change something from my suggestions, remember ask mancuso to repair the bubble
That's all from my part, my random appearance ended, good luck o/
