Finished the game tonight, so here's a little ramble of thoughts:
It doesn't really get much better than what I posted above. The remaining boss battles aren't particularly interesting and are realiant on pattern memorisation. On one of them you have to parry sequences of attacks in order to create an opening, and the parry window seemed far more generous than the one against normal enemies, so it's not very challenging. The other boss is just a couple of minutes of dodging stuff, with the difficult part being remembering the order of it's attacks. There were a few more enemy types encountered over the course of the game, and the most interesting enemy is one that you can't fight - they attack in packs and are designed to pressure you on your route to killing other enemies, so you can't just find cover and take a breather as they'll explode when they are near you. If you clear out the other enemies in the encounter, they'll die of...something. There is also your standard ninja enemy that dashes at you, and you need to parry his attacks before you can strike the killing blow. I'd describe the overall enemy variety as decent, but I think the enemy compositions you face could have been way more interesting. There a couple more enemy types but I won't mention them in case anybody does decide to pick up the game and would rather find out themselves.
There is a really weird feeling of inconsistency to the combat that I think is due to the enemy hitboxes. Sometimes, they feel enormous - you can kill an enemy when you're clearly not within your sword's range of them, and you don't always have to be directly facing them either. Conversely, there are other times where you'll miss, but based on the weird hitboxes you'd have thought you should have gotten away with it. Thinking about it, there's also a bit of inconsistency in the platforming, as you don't always latch on to walls and rails when you think you've got your angles right. It's mostly fine, but in a game that is absolutely a platformer, I think it needs to be better than that.
The story is barely worth mentioning. Utterly predictable from literally minutes in to the game, and with a bland and unsatisfying ending. I know action games aren't fabled for their stories but there is a lot of emphasis on it. If you aren't in combat, you're listening to somebody talk, so character and narrative development is constant, but sadly not interesting. I was hoping a title like this with such a strong aesthetic would have some great music, but there's only one track in the whole game I could hum along to from memory. The music sounds like exactly what you'd expect it to, only not as interesting as you'd hope. Certainly doesn't have musical flair in the same way something like Hotline Miami does.
The upgrade customisation is largely pointless. It does offer you some variety, but it's really not that useful. I feel like I may as well have just played the game as a no-upgrade run (not that it would have made the game any more fun). As for the abilities...well, I think I used them maybe 5-10 times in the whole game. For context, imagine attacks that cost meter or require a cooldown in any game you like, and then using any combination of them 5-10 times across the entire game. The most interesting ability you unlock is received within the last hour of the game, which is a shame. I'm sure speedrunners will be able to do some outrageous things with them, but for completing the game they're largely unnecessary.
I'd say there is replayability if you're in to speedrunning. It's literally a speedrunning game with combat tacked on. Once you've beaten the game you can replay any level with all your abilities, so you can do a New Game +. However, there are no difficulty settings, so you'd only be replaying the game to beat your performance in terms of time/deaths. I died a whole bunch of times and still managed to beat the game in about 6-6.5 hours.
Performance was hit and miss. In the main sections it keeps a solid (and high) framerate for near enough the entire time, which is great. However, some sections of the game take place in what I think was called the Cybervoid, which is like a VR world. The performance in these environments was disappointing and featured frequent framerate drops. Some of the most challenging platforming in the game takes place in this environment, which made that section of the game a lot more frustrating than it needed to be. For the record, I'm playing on PC, so I don't know what console performance is like.
I'd say if the game was on sale for £5-10 (or your regional equivalent) and you've seen some gameplay and it's piqued your interest, then sure, why not. Otherwise, I'd recommend spending your money on something else. It's the sort of game that if I played it on game pass I'd think that it was a good contribution to getting value for money out of my subscription, but to buy it outright...not so much.