[General]
The offset is seriously wrong, i think about +18 (52) is much more accurated.
You probably need 1s lead-in time.
The countdown is still enabled in [Normal], disable it plz. Also the preview time in [Normal] is different from the other 2 diffs.
The use of hitsounds is nice but... When you want to add whistle hitsounds on slider's beats, don't want to save time, just choose the slider and press W... this will change the sound of sliderslider, choose the beats and then add whistle plz. It's really noisy now... a easy solution to it is add a mute soft-sliderwhistle.wav file in your folder and full submit again.
Seems you're a fan of sliderarts, that's not a bad thing but make sure you could do your best with them, otherwise it will ends up with ugly effects.
[Normal]
00:18:579 (6) - change this to a 3/4 repeated slider? this could fit the beat on 00:18:988 & 00:19:397.
01:09:852 (6) - ^same thing, also you can add a beat at 01:10:943
02:07:684 (6,7,1) - the flow is really strange here... maybe sth like this?
[Hard]
00:06:034 (1,2) - ...well if you want to do sliderart, try to do the best.
01:04:261 (6,1) - i don't know the reason why you suddenly increase the spacing here, though you have a new combo.
01:09:715 (1) - how about add a note then start the spinner?
02:00:033 (2,3) - move 3 farther, it's ugly now...
02:56:761 (3) - the finish pace sounds really boring start from here.
[i_k's Insane]
00:35:779 (7,1) - do you think it's too hard..?
02:19:688 (7) - should end 1/4 earlier.
Don't want to focus on certain places to fix (because it's really...there are many of them), you may pay more attention to the flow, and also the structure (i mean try to put notes in a more good-looking way)