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This species looks like Haminoea sp. 1 in IPN at page 26.
All of these species have orange spots of various sizes and are very similar:
Haminoea sp. 01 which differs by its additional greenish-yellow, black and purple spots, none of them is surrounded by opaque white
Haminoea ovalis which differs by its additional rounded black and purple spots,
Haminoea cymbalum which differs by broad orange bands and spots surrounded by opaque white.
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426 pp.
How to cite:
Köhler, E. (2016), published 24 June 2016, Haminoea sp. 02 Genus: Turton & Kingston in Carrington, 1830
available from http://www.Philippine-Sea-Slugs.com/Cephalaspidea/Haminoea_sp_02.htm