Edit: Hi, as it has been pointed out to me by a few people already, I messed up my wording in regards to the full screen aspect. I made it seem like you CAN'T full screen. You definitely can. There are multiple ways to. Just not the orthodox way of simply going into the settings menu and changing it like you would on any other pc game. I'm sorry if I misled you. I would also like to make. TL;DR below this

Edit 2: Hi again, I got a lot of people aggressively telling me to just "press alt+enter" and to anyone who wants to suggest it, I hate to say it but it actually doesn't work. Pressing alt+enter does not do anything at all. ALSO I never got to mention this in the review but a lot of comments made me realize that I should. There isn't a proper way to go to the main menu in Sigma 2, nor is it easy to close either sigmas out entirely. You'll HAVE to use task manager because again, this is a bad port.

EDIT 3 (6/28/2021): Hi everyone, so at the time of this edit, update 1.0.0.1 came out and fixed some of the jarring issues of this game. Somethings that were changed were

-The mouse cursor now being hidden upon entering full screen mode
-1440p Support
- Game now remembers if you selected full screen or windowed from last launch
- There is now finally a way to exit the game from the pause menu. Instead of having to press a weird combination of buttons to go the start menu then select exit game, you can now press another weird combination of buttons to exit the game entirely. As strange as it is, I think we all appreciate there's at least a way to exit the game even if it's just a little unorthodox. It's way more convenient than the former method.
There are other minor changes but in my opinion these are the best ones done. I saw that they even mentioned that they wanted to add graphics settings. If it's any good, then I will review it again and reconsider my rating while still keeping the original post so anyone can see how far along this game has come. I really do appreciate anyone reading this far or even trying to check up on the game to see if it has improved. Hope to post here again soon!

TL;DR (7/12/2021):
I like to think that all of our reviews helped make this port somewhat better. I'm wanting to leave everything in this review in tact so anyone can see the history of this port.
As of update 1.0.0.2 they've added graphics options that would make this game a sub-par port. I can say that this game may be good to get if on a sale. Thank you for reading.

ORIGINAL REVIEW
I played the original "Ninja Gaiden Black", then played the Sigma versions on PS3, then played Ninja Gaiden Black on Xbox One via Backwards compatibility. THEN I played it on an emulator to try to relive some type of nostalgic memories and realized that the game held up really well especially since it was running on something that wasn't even supported by the developers. I then waited for years for news to break on whether or not this game would get released on PC since I was finally able to afford to build one and play games in the best quality possible. I always told myself that "Yeah I love Ninja Gaiden so much, I've bought the games like 3 different times, but if it were to ever come out on Steam, I'd buy it for 60 dollars all over again." As crazy and devoted as it sounds, I just enjoyed the game for so long that it just made sense to have it in my steam collection. We're now on the day that it finally came out, what's essentially considered a "rapture" day for me since I never truly thought it would actually happen, only to be disappointed.

So, most of my review is actually based on the port itself or lack thereof. The game is good. If you haven't played it, please do on whatever platform you can. If you like fast-paced action with high skill ceilings or don't need a detail rich story or you just want a reason to break your controller so you can get the new dual-sense, then get this game for sure... on a sale. I just want to start with this so that you can understand why I'm leaving a negative review. KOEI TECMO needs to catch flak because they have done their consumers a disservice way too many times to not get called out on their laziness.

I started this game up and immediately was met with a windowed screen that I thought I could change in the in-game settings. No. There isn't a setting for full screen. In fact, you should treat this game like a web browser or an indie game made by a single person. In order to make it full screen, you'll have to fiddle around with the window until you can click the full screen button you usually see on regular applications. They call this game a "bare bones" port. It isn't even that. It almost feels like you’re running this game on some web browser like a flash game. This game doesn't have ANY settings apart from the ones that allow you to change brightness and contrast. Like I said before, there isn't even a full screen option.

Resolution? The game does this weird thing where it tried to figure out what resolution you're playing on instead of allowing you to change it in the settings because again, there are none to change. This means that you have to do what the publishers suggested you do in order to change the resolution which is to go into the launch options and change it manually. They legitimately want you to do it yourself via a steam command instead of taking the time to simply do it themselves. It's not a matter of player laziness, but instead greedy corporations and their complacency. I know that seems like it might be coming out of left field, but please keep in mind that this is coming from the game publisher who wants you to pay them over 1000$ for their last two games, so 2000$ in total in order to play a fighting game and all the DLC in said games. (I'm referring to DOA5 and DOA6). Players aren't too lazy to change these settings, but publishers are getting too greedy nowadays and charging over 40$ just to roll out fodder. I haven't even gotten to what I believe is the worst part about this "bare bones" port.

The first time I went to open a chest up in the first level, I noticed that the button prompt was strange and didn't look like a normal one that I was used to like the Xbox "B" button or the Playstation's "O" button. It was still a "B" but it just looked...funny. I continued playing but felt weird and didn't like how the controls were mapped so naturally, I looked for some controller configurations and found absolutely none. I figured that was kind of weird considering the game's store page boasting "Full Controller Support". So, I closed the game and tried to figure out why the controls were so weird, that's when I saw on one of the tabs "Steam Controller Configurator". This game, which was advertised to not have ANY keyboard and mouse controls btw, doesn't even have proper controller support. It instead, relies on the steam's implementation of controller configuration or an alternative to Xinput in order for you to play. This one I don't even understand to be honest. This doesn't even paint it in a greedy or lazy light. Because they could've just left the game to have the PlayStation button prompts and let people like me who were using an Xbox Controller to deal with it. They instead opted to go for doing some halfway support for controllers by using the steam controller configuration which just feels more awkward than anything else. The button prompts they chose to map for the controllers don't even work some of the time. It's just strange all around. So disappointing. Nothing good to say about this port.

Oh, and btw, if you read the minimum requirements and told yourself you probably can't run it, you're fine. The game DOES NOT need a GTX 970 to run. They were just too lazy to test that too.