First off, yes this is a true Rogue-like. Not an action Rogue-lite, not a RPG with Rogue-like features.

Sword of the Stars: The Pit boasts turn-based gameplay, has perma-death and features elements of randomisation to make each run unique. There are 3 classes to choose from in the base game (12 in total with all DLC) each with their own stats and starting equipment and each plays very differently. Tactics and strategy are a must if you want any hope of getting anywhere in this game because in true Rogue-like fashion, it's hard as ♥♥♥♥.

But you're already prepared for that to be the case right? You wouldn't be perusing this type of game if you weren't. So yea, the game is hard, even on easy.

Inventory management and prioritisation is really important in the Pit and is well implemented with a grid-based inventory within which you have to shuffle stuff around and decide what loot to take and what to leave behind. (you can always backtrack to pick up stuff from earlier as nothing de-spawns, you can only backtrack 2 floors however).

-Status effects abound! Burning, Acid, Fear, Blindness, Wounded, Slow, Paralysed, Cold, Poison Etc.

-Has melee, knives, blades, powered blades and many different gun and ammo types as well as grenades and mines (and Psi powers if you have the Mindgames DLC)

-A crafting system which becomes deeper with every playthrough as you will discover recepies which are permanent.
-Lots of stats-based activities such as foraging, mechanical, computing, lockpicking etc to gain that much needed advantage.

-Loads of enemies. They will ruin your day if you let them.

As you can probably guess, I really like Sword of the Stars : The Pit. I'd recommend getting it if you like the genre as it is a fine example of how a game like this should be done..

TL;DR: Like a challenging, engaging Rogue-like? SotS: The Pit has your back.

TL;DR 2: Basically A Sci-fi Dungeons of Dredmor (Which is also awesome so buy that too if you don't have it)