Here are some of my suggestions:
By the Way, don't expect for me to pick out the hitsound errors.
General:I would recommend to either to add an additional difficulty with approximately 2.8* or make FreeSongs' Hard easier (from 3.53* to about 3.1*),
however then you would need a Light Insane diff (approximately 3.9*) to make diff jumps lower than 1*.
Also, add "Killing Art" and "Spring Roll" to tags as they have mapped in your mapset.
Easy: - Change the Approach Rate to 3
- Change the HP Drain to 2
- Increase Tick Rate to 4
01:17:475 (5) - Reverse Slider - Change the position so that it is similar to the picture (
https://osu.ppy.sh/ss/5763491)
02:41:475 (1) - Spinner - Extend it to 02:45:675 (
https://osu.ppy.sh/ss/5767253)
These were the only flaws I found in this diff
Normal: - Change the Circle Size to 3.5
- Change the HP Drain to 3
- Increase Tick Rate to 3
- Why don't you increase Slider Velocity to 1.0 or 1.1?
01:30:675 (1) - Spinner - Shorten it to 01:31:575
01:31:875 (1) - Spinner - Create a Spinner which ends on 01:32:775 (
https://osu.ppy.sh/ss/5767026)
02:29:475 (1) - Spinner - Shorten it to 02:30:525
02:30:675 (1) - Spinner - Create a Spinner which ends on 02:31:575 (
https://osu.ppy.sh/ss/5767036)
02:41:475 (1) - Spinner - Extend the Spinner to 02:44:775 as the spinner should cover up the vocals.
The main thing is that there is a problem with the spinners in this diff, I would say.
FreeSongs' Hard: - Change the Approach Rate to 7 as there is a big jump from Normal's to FreeSongs' Hard
- Change the HP Drain to 5
00:50:775 (3) - Slider - Extend it to 00:51:075
00:51:075 (4) - Reverse Slider - Remove it
00:51:375 (4) - Create a slider which ends on 00:51:525 (
https://osu.ppy.sh/ss/5768789)
02:07:875 (1) - 02:17:175 - Remove all the objects here and create a break here instead (
https://osu.ppy.sh/ss/5768797)
This difficulty here is a bit of a problem child as the jump between the difficulty spikes up here drastically currently.
As mentioned in the General section, I would recommend either to make this difficulty easier, or create a new diff to cover up the jump.
Insane:This is a very good map and I don't have anything to say aside from that it is very enjoyable
Killing Art's Lunatic: - Change the Circle Size to 4.5
01:01:350 (3) - Slider - Move it to 01:01:275 (Blue tick to White tick)
01:37:275 (1) - Reverse Slider - Extend it so that there are 2 reverse arrows. (
https://osu.ppy.sh/ss/5766898)
02:04:650 (2) - Circle - Move it to 02:04:725 (Blue tick to Red tick)
02:16:275 (1) - Reverse Slider - Start it at 02:16:125 and extend it from 1 to 2 (
https://osu.ppy.sh/ss/5766919)
03:04:500 (2) - Circle - Move it to 03:04:575 (Blue tick to White tick) and
perhaps arrange it like it is on the picture (
https://osu.ppy.sh/ss/5766936)
This difficulty has problems with Kiai (as Kiai mode should be consistent throughout the mapset)
- Change the 3rd Kiai on this diff from 03:06:675 - 03:35:475 to 03:06:475 - 03:25:875
Spring Roll's Extra: - Change the Circle Size to 4.5
- Change the Approach Rate to 9.2
- Change the HP Drain to 6.5
00:51:675 (6) - Slider - Remove it and...
00:51:525 (6,7,8,9) - Circle - Create these circles (
https://osu.ppy.sh/ss/5766697)
00:53:850 (7,8,9) - Circles - Create the circles and arrange it like this : (
https://osu.ppy.sh/ss/5766705)
00:54:675 (1) - Circle - Move the circle to the end of the slider (
https://osu.ppy.sh/ss/5766708)
02:16:875 (6) - Circle - Change this into silder and remove 02:17:175 (1) (
https://osu.ppy.sh/ss/5766747)
02:59:025 (4) - Slider - Create slider ending on 02:59:175 (
https://osu.ppy.sh/ss/5766766)
03:01:425 (5,6) - Circle - Create these circles to remove that little break there is (
https://osu.ppy.sh/ss/5766769)
03:03:075 (1) - Spinner - Extend it to 03:05:175
03:45:150 (1) - Spinner - Remove it so that the ending time remains the same throughout the mapset
This difficulty has problems with Kiai (as Kiai mode should be consistent throughout the mapset)
- Change the 3rd Kiai on this diff from 03:06:675 - 03:35:475 to 03:06:475 - 03:25:875
Magical Astronomy: - Change the Circle Size to 5
00:50:775 (4,5,6) - Circle - Remove these and instead create the slider (
https://osu.ppy.sh/ss/5766809)
00:53:175 (4,5,6) - Circle - Remove these and instead create the slider (
https://osu.ppy.sh/ss/5766817)
00:58:275 (3) - Circle - Remove it to fit the music (
https://osu.ppy.sh/ss/5766827)
That is all I have to say. I hope that my suggestions will improve the map (since I love this map and I hope that it will be ranked)