It depends on which feature you're refereng to, for example depth in the story or gameplay mechanics. In the case of gameplay mechanics, depth in a game is how complex it is, how deep it can go in its gameplay.
It has nothing to do with the imagination or story.
For example, bounty hunting is shallow because its just going to certain places and kill many ships with bounty. They just continuously spawn so you can kill them. There's no "bounty hunting", its just a fishtank with cash.
If for example, you had to chase the bounty through different locations, stations, talking/bribing NPCs, use equipment on your ship like satellites or probes, look at station logs, hear bar rumours or hacking datacenters to find your target, then that would be Depth.
But no, this game doesn't play like that because its simple.