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This specimen was identified by Arne Kuilman on the favebook group Marine Flatworms, thanks!
He wrote: "Paraplanocera sp. (I've seen the same one in Bali)"
This species or at least a very similar one from Hawaii is as Paraplanocera sp. 1 at http://www.hawaiisfishes.com.
How to cite:
Köhler, E. (2018), published 29 May 2018, Paraplanocera sp. 04 Genus: Laidlaw, 1903
available from https://www.Philippine-Sea-Slugs.com/Look-alike/Platyhelminthes/Paraplanocera_sp_04/Select.htm