I've played Deep Sky Derelicts, and I have to say, the energy thing isn't really a big issue. It's really more a thing that exists to keep you from just running all over the place, and you can still explore an entire derelict if you're willing to take multiple trips (actually, it will most likely take multiple trips to clear an derelict anyway).
The bigger issue is probably hitpoint/damage inflation from the monsters as the game goes on, although I suppose it's probably only about Darkest Dungeon levels of that, and I probably didn't have the most optimized team. But, yeah, I think it can end up like DD where you face monsters that it takes you a lot of turns to take down, and they deplete your health to the point you need to retreat.
Thinking about it, it really is like a card-based DD, except you have one team and you have more ability to customize them and you don't have to manage anything but hitpoints and gear. Also, you don't lose anyone if they lose all their hitpoints in a fight, you just can't use them until you go back to the station and heal. And exploration is more freeform.
All-in-all, it's pretty good.