00:03:286 - this difficulty progression seems a bit off. The only difference with the Normal diff is that there is an extra ln hold, while the Insane diff has 1/3 streams with frequent minijacks. I recommend ramping up the difficulty of this section. One suggestion is deleting the long ln and add 1/3 streams at points where the piano notes rise its pitch like 00:06:857 - or 00:08:285 - while making other notes 1/1 lns. Something like this maybe
00:14:268 (14268|3,14357|2,14446|3,14714|2,14714|3) - This may potentially cause a hand bias. Also questionable use of minijack
00:23:285 (23285|3,23285|0) - This should be a triple similar to 00:20:428 (20428|0,20428|2,20428|1) - and 00:24:714 (24714|0,24714|3,24714|1) -
00:27:928 (27928|3,28464|3,28643|3,29000|3,29357|3) - Very stacked ln usage on the 4th col. You can consider relocating some to the inner cols
00:35:607 (35607|1) - Should be 1/1 in length in case ur using the same concept as 00:30:964 (30964|1) -
00:51:857 (51857|3,52125|2,52214|1,52214|0) - This violates the RC: Avoid chords with more than 3 notes. This includes long note patterns that involve notes in more than three columns. Also applies other similar patterns in this section
01:59:446 (119446|1) - You can put this note on col 3 or 4. There is room to avoid the 1/4 gap with the ln release
02:24:357 (144357|2,144357|3,144535|2,144714|3,144893|2,145071|2,145250|3,145250|2,145428|3) - jack patterns on the right hand is significantly harder
02:26:143 - This part onward is actually easier than the part before it which are heavy jacks 02:25:250 (145250|3,145250|2,145428|3,145428|0,145607|2,145607|1,145785|1,145785|0,145964|2,145964|0) - This makes little sense cuz the music is progressive. You can try adding more jumps for this part
02:28:285 (148285|1,148553|1,148821|1) - This triple stack is questionable since there are no similar sounds like that. Moving 02:28:821 (148821|1) - to col 3 can make it more comfortable to play