I bought got this in the Indie Gala 3 bundle several years ago and only now got around to playing it. It took me almost ten hours to get to the end of Normal difficulty using the Marine. Ctrl+F "TL;DR" if you don't wanna read all this.
Before I start, I'll say two things: First, I'm going to make reference to the Diablo series quite a bit here. The second is that this is a not-recommended review because I didn't really enjoy it, not because of any particular flaws.
Greed: Black Border is Diablo in Space. You explore a set map for each area, you fight enemies, you get drops, you make money, you level up and get better skills. You start by taking your pick of three classes: The close-range Pyro-Soldier, the mid-range Marine, and the long-range Plasma-Engineer. Starting with a story sequence, now you're on a large ship and you have to go free your own little ship from impound. And on the way, you fight zombies and robots. Later on, you're in a desert area fighting desert critters, and finally you're in a cave fighting robot bugs.
Gameplay is fairly simple. Isometric view, you have a minimap in the corner, left-click to move, left-click enemy to attack, Shift+click to attack without moving. All of the classes are in some way ranged with the Pyro being the one most likely to get into a close-ranged fight and the Plasma sniping everything from afar. You're gonna do a lot of kiting. All classes have a regenerating shield, a set amount of health that doesn't regenerate by default, and an energy bar to fuel special moves. There's also a regenerating bar for dodge-rolls with WASD or the spacebar, though you aren't immune to damage during them. Not being able to spam dodge-rolls sorta harms their effectiveness since you don't exactly get very far away in the process.
All classes have skill trees. Raise one skill, unlock another, that sorta thing. What is interesting is that apart from your basic attack, you can have an active right-click skill, a passive offensive skill, and a passive defensive skill all equipped at the same time, so it's a matter of figuring out which ones are good and then dumping your skill points into them since unequipped skills obviously don't work unless equipped.
I wouldn't say it's a lootfest like the Diablo games. Sure, gear and money drop, but there aren't any magic items. You find gear that your class can equip only, but only basic things drop. This means that for the most part, the better stuff you find is just numerically better overall, nothing really different other than appearance, and there was no variety in weapon types. For the Marine, the only weapons I found were miniguns and I imagine the same situation applies to the other classes. You can add affixes and traits to items by putting in socketables, though there still isn't a very big variety of effects, mostly +X energy or maybe +X a set of skills or +X% damage. It took me until near the end of Normal just to find gear that had affixes already applied to them! At least everything shows up on your character.
There's a store, but you don't get access to it until maybe halfway through the first chapter. You get a device that lets you warp to him every five minutes, though his stock doesn't really update often. You can recycle your gear for a pretty generous return on money and a chance at making a new socketable, though I ultimately felt that money didn't have much point. I never felt like I had to save up money for something good, just that anything good the shop had I'd buy since I had more than enough anyway.
Maps are huge, like, they'll take you an hour for each one or so. There's no randomization here, and there are some puzzle elements, like reading a note and then using the numbers to get through a code console, or navigating over the safe spots on a damaging floor. There aren't many of these elements, though. A rather big problem I had was that this game only saves by checkpoints. And you have to manually walk up to one to save your game. It's very possible to just forget to activate one and lose several minutes of play. Or in an area where they're not common, lose time anyway when you die. I didn't find a way to scroll the minimap though I actually didn't get lost at all. There's only one running speed and outside of the final areas, no way to get around the map than just regular moving. There didn't seem to be any backtracking either, not that there was a good reason to back somewhere.
I didn't keep count, but I think there were maybe 30 varieties of enemies to fight. Like dropped gear, they didn't have any really remarkable traits, so you either fought the garden-variety mook or its upgraded version. There were bosses at the end of the three chapters at least, but each chapter was filled with cutting through a slog of the same enemies. They weren't very interesting, just a few long-ranged ones you could easily tank or evade and a lot of melee ones that you could easily kite. Granted, I did die a few times though it was more to environmental hazards/puzzles than enemies up until the final chapter. Watch out for those Gun Drone Overlords.
There isn't much for plot. You answer a distress call for a mining ship and your ship gets impounded, then you crash onto a planet and have to find fuel cells. That's basically it. There is quite a bit of world-building done given the story with the five colonies and you even get little news bulletins from the outside world as you play, though they're ultimately pointless, like finding the history books in the first Diablo. The setting is nice, a Diablolike that isn't a high-fantasy world but future space sci-fi and all. And of course the game ends on a sequel hook cliffhanger and nothing's probably gonna happen on that front. There is voice acting, though that too's not very remarkable. Your character makes some comments during the game but for the Marine, they were almost impossible to hear or understand, even after fiddling with the sound options.
TL;DR: I don't know. Greed isn't a bad game, it's just not good. It's average. Underwhelming. The things it does, other games do better. The game gave me zero issues like crashing or bugs or whatever, but I just didn't really enjoy my time with it. At least it's kinda pretty.
I'd say unless it was like 90% off, you can probably avoid this. It's still too bad, since it feels like the first episode in a longer game and there was nothing wrong with it outside of it not being remarkable. I might be convinced to go back and try Hard Mode for a little while though I have a feeling it's gonna be more of the same.