i tend to think elevator pitches are less important nowadays because of the proliferation of youtube trailers. it's easier to just embed a trailer of your game on your site than write a few sentences about it; most people visiting the site will skip the sentences anyway
however, this is what eva has written for SD's website right now:
Save your friends. Save your enemies. Save yourself.
Saturated Dreamers is an open-world adventure game set on Lake, a sentient ice planet that holds many secrets from expeditionists Mercedes and co. Players assume control of the Leda, a ship equipped with unique gadgets that can be used to solve puzzles, befriend creatures, and purify Lake's waters.
looking over it now, expeditionists kind if is too easily mistaken for exhibitionists tho, so it's probably not the best word to use there, but this isn't final
I think the elevator pitch is still important because you need to get people to click on the trailer in the first place.
Immortal Defense's one line summary doesn't describe the game at all, and would not make a reasonable elevator pitch, either to investors or prospective players.
I agree that 'expeditionist' reads oddly. It's a legitimate but little-used word. I'd say 'Mercedes and her expedition'. Also, when pitching at players, using 'you' rather than 'players' may be more engaging.