I've seen like two or three trailers for Deathloop by now and they still can't communicate effectively what the real goal is. Is it to keep respawning to kill a particular enemy, kill other players (given it's also a multiplayer), complete a set of objectives? Is it a rogue-lite where some items are kept or upgradable between runs?
All I can tell from these is it has some mechanics and similar art style borrowed from their Dishonored series and there's a general theme of some mechanic that resets a player if they're killed.
Then I go to the Wikipedia synopsis and it explains the actual premise in a few sentences.
Edit: then later they release
a video of a dev on screen explaining what you do, clearly, in the first minute