I'm still getting 6,540-6,550 for the offset - 6,570 feels kinda late, although with such an easy stage it doesn't really matter when it comes to 300s vs 100s...
At any rate, DessaChan, looks like you forgot to resnap when you changed offset from 6,540 to 6,570
Resnap and make sure to look over the map for anything that still needs nudging. Pretty much everything should fall on a white or, less often, a red line. Your spinners sound better when nudged backwards to the nearest white line, since that's when the chorus starts (You're the one...)
The part between 02:45:81 and 02:55:96 doesn't seem easy to map - 02:51:10 (2) and 02:55:07 (3) aren't very intuitive. I suggest to turn the section after the heart-shaped slider into a break, remove the break before that slider (by right clicking on the break rectangle on the timeline) and put something in.
I'd also suggest making at least one more difficulty that's harder.
Finally, I think the custom hitcircles have a slightly flat right side, which is possibly due to the image you used being square and slightly too large for the circle. You don't need to improve this for me to approve of your beatmap, though (end nitpick)