00:04:997 (4997|0) - This is a ghost note, the 1/8 piano only goes on until 00:04:943 (4943|1)
00:08:530 (8530|0) - would suggest moving this to col4 instead as to not make it going into an ln
00:12:660 (12660|1) - I suggest to move this note to the left so this part feels more balanced (no note in 1st lane :c)
00:31:356 (31356|2,31356|1,31356|0) - triples seems like an overkill for what seem to a be a tinier sound compared to 00:31:138 (31138|2,31138|3) -, would suggest
00:31:356 (31356|2,31356|1,31356|0) - to reduce sound like these and similar to just doubles. to add this would also follow this guideline
Additional guidelines for 4 key Normal difficulties:
Avoid chords with more than 2 notes. This includes long note patterns that involve notes in more than two columns. However, using a double that is played with the other hand than the long note is fine.
00:38:530 (38530|1,38747|2,38965|1,39182|2) - i would suggest re arranging since it might be middle col heavy,
00:42:878 (42878|3) - Remove note? You didn't add a note in parts like 00:40:269 (40269|1) despite the sound being there, so it's inconsistent
that sound is supposed to be represented, so i will do the opposite and add a note on 00:40:269 (40269|1) -