00:03:000 (3000|6,3100|7,3200|8) - I can figure you want to emphasize main piano sounds
00:01:200 (1200|1,1300|2,1400|3,1800|5,1900|6,2000|7,2400|0,2500|1,2600|2,3000|6,3100|7,3200|8) but this part is very weird because the pitch at 00:03:000 - 00:03:500 is descending part, the atmosphere is slightly different compare to 00:01:200 - 00:02:800.
Changed the pattern to be descending.
Changed 00:01:800 (1800|5,1900|6,2000|7) - to also descend to keep the patterns feeling more consistent so that 00:03:000 (3000|8,3100|7,3200|6) - doesn't feel as whiplash-y
00:19:200 - 00:21:600 - Replace to LNs will be better in this part not prevent big gaps between Easy and Normal diff. Also it is weird emphasis compare to 00:01:200 (1200|1,1300|2,1400|3,1800|5,1900|6,2000|7,2400|0,2500|1,2600|2,3000|6,3100|7,3200|8), if you have reason to make 3 stream at these parts, please answer it what sounds you want to emphasize.
00:23:000 (23000|0,23200|2,23400|5,23600|4,23800|2,24000|5,24000|0,24200|3,24400|5) - I think this patterns break hand balance; these cols are too focused for left-hand players so I'd like to suggest adjust these notes to col 6~9.
00:30:000 (30000|1,30100|2,30200|3,30300|4,30400|5,30600|3,30700|4,30800|5,30900|6,31000|7,31200|1,31300|2,31400|3,31500|4,31600|5,31800|3,31900|4,32000|5,32100|6,32200|7) - This stream is too hard to read in Normal diff, violating o!m RC. Try to make light density compare to easy diff. I recommend using 1/1 snaps, considering BPM.
Stairs are an easy pattern to read compared to others. There is a 1/1 gap between each stream section per bar as required by the ranking criteria. While it is fast, this is only at the final section so it should be a little more challenging compared to the rest of the song in my opinion