They took a few elements from the 2013 video game, but not nearly enough. With some condensing, the story and characters from the game would've made for a better movie than this script. I'm surprised Square Enix didn't read the first draft and tell them to go back to the drawing board. They jettisoned all the engaging material.
What's left is decent action sequences and not much else. The whole opening 20-30 minutes are unnecessary and just take up time that could be better used doing things on the island. Vikander and Goggins elevate the material, but the characters are all thinly written and poorly motivated.