Finished it yesterday. A good game, from 1-10 I would give it a solid 8; for reference: 1 (not recommended to even bother to check it out) to 10 (Star Wars KOTOR II non-patched). The encounter with *redacted* was particularly impressive, as he was portrayed as some sort of nearly-unstoppable force able to control material reality around him with ease, and the only way to "fight" him was to actually run away from him. I played on the Jedi Master difficulty, which is the second-highest available one.
I will not write a review or a summary, instead I will just say something about the exploration.
Individual locations, when first explored, are very linear; there are no alternative paths to get to a particular location and instead there is only a single, predefined path for the player to follow. The non-linear aspect comes into play later on, since not all areas of any particular location are accessible in the beginning, and instead rely on your return to them with new abilities (double-jump, Force pull etc.). When repeatedly visiting the same locations, shortcuts and alternative paths unlocked previously come in very handy, to save the player his time and effort in traversing them. The motivation to return to them is mostly for what the game calls "Secrets", which give you either additional "stim canister" (health-restoring packs) or increase your Force/Health meters. The maximum number of "stim canisters" is 10. I don't quite remember and I don't feel like checking right now, but I think there are about 30 "Secrets" all in all (the planet Zeffo has the greatest number - 14). For those much more invested into exploration, there are also 1. "Echoes" (places where something in the past happened, but which the player character is able to "read") which give you additional experience and thus allow you to progress further to acquire "Skill points" which the player then spends upgrading existing skills or obtaining new ones, 2. as well as cosmetic upgrades to his Lightsaber, outfit, BD-01 (the robot) and Mantis (the ship); however, most of these "Echoes" are easily obtainable on the first run, few require additional abilities to access to.
These cosmetic upgrades are located in chests littered over the locations, and I must say that - aside from precisely that cosmetic aspect - there is little worth in them; some of them even look plain ugly (almost all ponchos for example), and I feel that these chests were placed just so the developers could say there is "something" in the game world the player is able to interact with, beside an occasional secret, "Echoes" and enemies. At first, since I did not follow the development of this game at all, nor have acquainted myself with any information regarding it, when I first obtained a cosmetic upgrade, I spent a few moments searching the UI for information on "what does this upgrade do?", only to be disappointed that it does not do anything in fact, except for changing the look of something. This is aggravated furthermore by the fact how some of those cosmetic upgrades imply functional upgrades too - for example, you have "Duty and Resolve" and "Duty and Resolve II" as upgrades for the sleeve of the Lightsaber, and whilst I don't know how a sleeve could be functionally upgraded it still leaves a bad impression. The conclusion is that the player can freely leave aside chests and not bother with them, unless they simply enjoy the challenge of getting to them and obtaining them all (which is fine in my book). But objectively speaking - it brings nothing new for the player in terms of mechanics and function.
Art direction of the locations is very good; I particularly liked exploring the three tombs of the Zeffo sages. What is a particularly nice "touch" so to speak is how different tombs indicate and "speak of" different eras of the Zeffo civilisation, and starting from the oldest and thus the first tomb: the first one glorifies the Force, the second one glorifies power and achievements of the Zeffo civilisation, partly based on manipulation of the Force (notice the fall here: from being focused on transcendent and immaterial to being obsessed with the material, complete with hedonism and vanity; this is actually both subtly and directly spoken of within the game), and the last one glorifies a particular individual, the last of the Zeffo sages who was also a tyrant. In "terms" of the Force, this progression is like: the Force itself, then the Force corrupted with carnal desires, then deformed Force (the Dark Side). Liked this a lot, and it might show the influence of Chris Avellone on writing and world-building, which I consider good of course. All these tombs also show different styles, but still similar enough for one to be able to say they belong to the same civilisation, just in different eras of its "life" (or decadence and fall, if you prefer).
Well I think this is it for now.