Looking for name of a book about a mechanic boy and princess who survived a space ship crash and hated each other

Possibly Keith Laumer's "Galactic Odyssey".

The 2 people stranded on the planet are a Princess and a young man who is a "gun-bearer" for the rich spaceship owner who is a hunter who travels around to different planets to hunt dangerous animals with his friends.

When the owner and fellow hunters are killed, the Princess and gun-bearer are stuck on the planet because they don't know the pass-codes re-enter the ship.

Various covers are out there, but this is the one I remember.

CONS: I don't not recall an explosion of blue light that almost kills the Princes. But the hunters weapons do exhibit a blue flash when fired: "I heard the Z-gun make a sharp whickering noise and an electric-blue light flashed up and lit the rocks like lightning,"

This may be These Broken Stars by Amie Kaufman and Meagan Spooner, the first Starbound book.

He is a military officer, very high ranking for his age because of some heroics, and she is the daughter of a fantastically rich and powerful man. (He does have some technical knowledge that she doesn't, which they need to survive, but actually, she's the one with mechanical knowledge.) They are the sole survivors of a crash landing on a planet where they do grow together after much conflict.