by themselves, the difficulties are pretty good and well made. as a mapset, i can't really say the same.
General:- 01:04:532 - I would personally do a re-kiai time here, but not a big deal if you don't want to.
Can't say I'm a fan of the difficulty spread. Normal is full of 1/1 with the occasional 2/1 as well as constant distance spacing everywhere. Jump between Hard and Insane is pretty big as well, considering the fact that Hard is mainly 1/2 and 1/1 while Insane is 1/2 and 1/4 streams, but not as fussed about that.
Also consider the slider velocity used in the diffs:
Easy: 0.70
Normal: 1.00
Hard: 1.60
SC's Insane: 1.80
There's a fair 0.30 difference between Easy and Normal and a small 0.20 difference Hard and SC's Insane. However between Normal and Hard, there is a whopping 0.60 difference. That's twice as much as Easy/Normal, and three times as much as Hard/Insane. This could normally be solved easily by increasing SV of Normal to say 1.20, but then because of how easy Easy already is, there'll be a problem there instead.
I dunno, I really don't know how to fix this with as little effort as possible. I've asked 2 BATs + 1 alumni about this (UnitedWeSin, Niva and Shiro), and they all had different opinions to give, so I suppose I'll discuss this more with the rest of the BAT in the meantime. Also have my thoughts on your diffs. with difficulty spread aside.
Easy:- If there's anything I don't like about this difficulty, it's how you often don't make good use of the available mapping area.
00:08:256 (1,2,3,4,5,6,1,2,3) - For instance, you have put these beats all on the right side of the playing area, for a full 11 seconds to boot. There's nothing wrong in making your sliders blanket each other and the beats, but please do look at the whole map when not just object by object. I highly suggest remapping this section and use the left side of the screen more.
00:23:153 (1,2,3,4,5,1,2,3,4,5,6) - Why you have copy and pasted this whole section is beyond me. Well at least overall with this and the section afterwards before the spinner, you make better use of the available mapping area.
00:49:636 (1,1) - Seeing how this easy is very easy with every beat being spaced 2/1 apart, I do think that the (1) beat afterwards comes too soon in comparison. However, just leaving it blank wouldn't be very nice as well. I suggest removing the spinner and mapping out the small section where the spinner was. You can do two hitcircles, a 2/1 slider or a 2/1 slider with a repeat to keep consistency with the rest of the diff.
00:52:118 (1,2,3,4,1,2,3,4,5,1,2,3) - Again, for a good 15 seconds or so, you've predominantly stuck to the top right hand corner of the field. I again highly suggest remapping this section to make the map move around the playing field more.
01:11:153 (1,2,3,4,1,2,3) - An example of how you quite easily moved from one side of the map to the other.
Normal:- Better in that you move around the field a bit more, but still some areas which bug me.
00:17:360 (4,1,2,3) - You've just come down from the top right of the map into the middle left area, so why go back up (and down) this side? Move down instead of going back up. The bottom right of the screen is feeling a bit neglected too, so move there a little.
00:34:325 (2) - No reason to stack with (4), pointlessly returning to the same spot. How about moving it so it's 180 degrees above (4) at x:384 y:72? Small change, quite a difference.
00:41:360 (3,4) - Again, you just came from the left side, why move back there? Well, you move around better afterwards, so this one isn't as bad.
00:58:325 (1,2,3,4,5,1,2,3,4,5,1,2,3,4) - Again, the issue of staying around in the same area of the screen.
01:08:670 (2,3,4,1,2,3,4) - Sticking around the top right of the screen.
Hard:- Apart from the fact that you use the same patterns over and over and over again (e.g. 00:02:877 (2,3) , 00:08:670 (2,3) and 00:09:911 (5,6) ), the difficulty was quite pleasant to play. But that's all, pleasant. Using a lot more varying patterns and rhythms would have made the difficulty a lot better and interesting.
SC's Insane:- Probably the best diff. in the mapset. Not particularly good, but at least it makes good use of the playing area and is pretty fun to play.
- I do think that the soft-hitnormal is too soft, but it just might be my sound settings.
- But that bass drum sound can be annoying, e.g. at 00:35:567 (3,4,5,6,7,8,9,10,1) . Should be used sparingly, like you mainly do throughout the diff.
Popping until further discussion with BATs, to prevent accidental ranks and the like.