Structurely, a) you've over priced the entry requirements, so you'll probably want to drop the whirling strike trick given your use of Parry boosts kinda requires the other, b) there's potentially a problem with granting Wuxia II which normally kicks in at level 16 -- a Martial Artist 8/Dervish 8 would have a dead level in terms of ability gain as there's no Wuxia III, a problem for an otherwise very likely build; replacing it with Superior Jumper II is an option, as is the combo of SJ I + rolling jump checks twice, and c) the game breaker feels "off"
Elsewise, there's nothing particularly wrong with it, But I think there's room for improvement
Requirements: Dex 13+, Acrobatics 4+, Mobility Basics, Whirling Strike Trick
1. Bright Blade, Misdirection
2. A Thousand Cuts
3. Dervish Dance
4. Misdirection, Wuxia I
5. Dervish Dance
6. Master's Touch I
7. A Thousand Cuts, Dervish Dance
8. Leaps & Bounds, Misdirection
9. Dervish Dance
10. A Thousand Cuts
Bright Blade: You gain a trick:
Bright Blade (Melee Attack trick): While attacking with two or more 1-handed melee weapons, when you inflict damage you inflict an equal amount of flash damage. You may use this trick a number of times equal to your Dervish class level.
Misdirection: At level 1, you gain the Misdirection Basics feat and a bonus skill point every level that must be spent on Acrobatics.
At level 4, you gain the Misdirection Mastery feat.
At level 8, you gain the Misdirection Supremacy feat.
A Thousand Cuts: At level 2, you are considered to have an additional number of melee combat feats equal to your Charisma modifier, and you gain the Fend trick.
At level 7, you gain the Back At You! trick, the number of times it may be used is instead based on the number of melee combat feats you possess.
At level 10, your Whirling Strike trick is no longer limited by the number of feats you possess or times per round it may be performed. Further, when attacking with two or more 1-handed melee weapons, your attacks gain the bleed and excrutiating qualities, as well as keen equal to your starting action dice.
Dervish Dance: At level 3, 5, 7 & 9, you may either gain one Basic Combat feat or take one step on the Path of Travel.
Wuxia I: At level 4, you gain the Martial Artist ability of this name.
Master's Touch I: At level 6, you gain the Martial Artist ability of this name.
Leaps & Bounds: At level 8, you gain the Superior Jumper I ability and may roll Jump checks twice, keeping the result you prefer.