There needs to be more bullet hells like this one. Also, for people who have gotten S ranks on every level, try dodging every bullet in Oblivion inside the hoop.
How to make the final boss seem easy:
1. Max out your main and sub weapon power.
2. Max out speed and base damage
OPTIONAL
1: Max out all your other stats
2: Disable Glow Effects
3: Enable cheats
4: Play as a character you are good with
If you just died from a harsh battle and and are broke, then here's a solution to get you back to full health and SP:compose your sheild and/or accessories with "get HP/SP when kill enemy, then kill a bunch of lv 1 slimes that will get you refreshed.
Its a great game; I got used to both mouse and keyboard controls, although I wish it would have customisable controls. A glitch happened to me; my "best so far" went to zero and I still was playing the song.