This is mapped and hitsounded surprisingly well, I have to say. Instead of going in-depth, I'll give you a couple of examples of things you probably want to correct or change.
Well, my post may sound a bit random, but I still hope it's useful.
- First thing is gonna be the offset. It's currently too early, so move it 25ms later (that makes it 2415), resnap all notes and also move all the green lines and the preview as well.
- I noticed you never used finish hitsound (even at times when it fits); remember you can mix samplesets and use the one from Normal sampleset, which sounds less harsh. Apply it to the head of 00:17:390 (2) instead of whistle¹ and see if you like it; go through the whole map and apply it everywhere else if necessary.
- Most of the time, if not always, you need to figure which notes (sounds, basically) in the song have accent and make them playable (that is, clickable: put a note or slider's beginning on it and you're done). For example, such note is 00:18:352, which you covered with a slider tail. Replace the slider by two notes and see how you become more aware of what goes on in the music, as it almost looks like it's you who makes that note sound. The other (and also the last, because everything else is on spot) place where it should happen is 02:05:205
- Don't just leave beats like 01:04:291 - unmapped; even if there's a calm section that fits for placing a break on it, the previous part of the map still needs a logical ending.
- 01:11:791 (1,2) - there's not really a point in using an overstretched slider; the music at this part is all plain and simple and has beats only on red and white ticks. Also, it would be nice to use a hitsound for these snares at 01:13:432 + 01:15:307 + 01:17:182; a soft whistle would do.
- 01:34:292 ~ 02:00:543 - first of all, I'd recommend you to map the whole part, as it's kind of catchy and doesn't really qualify for a (random and relatively long) break. You could also try to follow these vocal samples in the background and map the whole rhythm: http://puu.sh/nPxgX/2248a8aa37.jpg (or, if you want to make it more intense, http://puu.sh/nPxiE/829e87cea9.jpg). If anything, it should go instead of 01:34:292 (1,2,3,4).
- 02:00:543 (1,2,3,4,1,2,3,4,5,6,1,2,3,4,5,6) - while this follows music and is appropriate for higher difficulties, it's too hard compared to the rest of the map. The same applies to, for example, sudden jumps, when everything else before/after was rather calm and done in the same manner.
- Try to avoid random overlaps like 02:23:512 (2,3) which make your map look less tidy. The same goes for sliders that are too bent, like 03:02:419 (7) - or 03:13:670 (1,2) - (compared to curves you were using just seconds before)
- Every spacing change needs to be (or "should be") justified; it either has to follow the change in music (or your impression of it, at the very least) or be intuitive. For example, spacing decrease for 02:56:326 (6,7) looks random to me, as do 02:58:669 (1,2,3)
Well, my post may sound a bit random, but I still hope it's useful.