Only two spots stood out to me even if they do not save a lot of time might as well point them out. Whether or not these spots are improved or not won't have a bearing on the judgement. 1) Around frame 20100 there is this barrier preventing passage out of the section that needs to be damage to proceed. Noticed that if you switch to the missiles you can destroy them faster without waiting. 2) Around frame 46500 there is a part where to avoid a bullet you roll down, then jump up twice. Instead if you wait, then jump you can only have to jump once. This does not save time at all, but one odd thing I noticed is that around frame 51800 you can roll down the stairs to the left then if you try to proceed right, you can jump and fall into the water. The game respawns you on a ledge to the right, but you cannot proceed. You have to jump far to the left back into the water to get respawned back into an area where you can go back up the stairs. Was thinking it was possible to avoid that forced fight, but no.
I know you are saying you made this with the intention of it being rejected, but why do you think it should be rejected? Maximum score tases are accepted pretty frequently. I take it that 8:35 break in the spheres is actually the mistake in the game you were mentioning? Also the tunes in the game are decent for a rhythm game so it is actually not bad to listen to.
Is it set thru like dipswitches? I'd consider that an artistic choice more than anything.
Xipo has improved x2poet's run in 2011. And only 1778 frames slower than this run, and didn't use warp glitch. So it's means this run can still been improved more than 20s include boss fight. https://v.youku.com/v_show/id_XMzQ1Nzg0MjMy.html