I was also underwhelmed by the execution of the Trinity test specifically. I know they relied on solely practical effects, so it’s not realistic that they would match the awe of the actual test footage.
It didn’t leave with the same existential dread like other relevant media has in the past.
It’s a shame about the game’s uninspiring name and generic box art. Probably kept a lot of people from playing it. I only played it on a recommendation like yours.