To start: I used to add a header to these reviews, but since it often times made the review too long to submit, I've opted to leave the header on my Backloggery.
Gameplay: I gotta be honest; the comparisons between this and Portal are entirely superficial in my eyes; this game's puzzle design really doesn't have much to do with Portal's; for better and for worse. Well... for worse, honestly. As you've probably figured out by now, this game is about time travel. You can also clone yourself and have clones follow the moves you've done exactly, and by the end of the game, you may have six or seven clones of yourself darting around the level to press switches... and that's about it, really. There's a few other elements that get thrown in there, but that's about it.
Pretty much every single puzzle in this game is a sequence puzzle, in which the standard way of playing the puzzle is: go in, push closest switch, look around until you find how that switch blocades you from solving the puzzle, rewind, send clone to press switch before puzzle becomes unsolvable, rinse, later, repeat. Even after the three hours that it took me to complete this game, I was already tired of just going through the motions in a different order time after time after time again. That's not to say that every puzzle is tedious and boring as hell; in fact, there's actually some pretty clever puzzles here and there. It's too bad most of the puzzles are just kinda okay.
In fact, that's pretty much how I'd describe this game; just kinda okay. There's definitely one area where it seems like all the effort went into (and I'll talk about this later on), but I wish more work had gone into the puzzles and into creating new, fun elements rather than the same old tired things that the game uses again and again. It's just really tedious; an example of a really great idea executed not very great. 5/10.
Story: It's just kinda okay. The earlier parts of the dialogue (there's no voice acting BTW) had some pretty obvious grammar errors and typos, but it started getting sorted out by the end. However, that could also be because I stopped paying attention to the story about halfway through. You can tell that the authors cared about these characters, but the issue is that I didn't really care about the characters. This is somewhat of a "your mileage may vary" criticism, but for me; I really couldn't care less about what went on with the characters. Plus, some of the dialogue is kinda silly given the scenarios, such as a woman using polite grammar while supposedly vomiting blood and gushing blood from her eyes. It also doesn't help matters that the story tries to be grimdarkian by the end, which just ends up sounding silly more than anything else. 5/10.
Graphics: Yup, here's where all the effort went into. There's a lot of polygons here for a team of seven people. However, there are some technical aspects that are rather disappointing, such as the lack of fine control of graphical fidelity. As far as graphics go, you've got options for resolution (which it starts out in 1366x768 for some very odd reason; also yet *another* game that doesn't use autodetect resolution functions) and a catch-all graphics option, and that's your lot. The game never taxed my card all that much, but it's still a very good idea to give the user that fine control of graphical fidelity if they happen to be using a less beefy card than my GTX 760. Also, there's no anti-aliasing, which unfortunately makes this game look a lot worse than it should. Other than that, Sparta 3D (their proprietary engine) seems to be one solid 3D engine. However, the game is honestly lacking in art style. Pretty much every level looks the same, and even the at-first very impressive sight of Jupiter through the windows becomes rather tedious after the ninth or tenth time. Again, a very high-polygon count game unfortunately marred by the lack of anti-aliasing, fine graphical control, and unique art style lead me to give this game a 2/5 for the visual side. Also, there's blood everywhere for no dang reason and it gets silly after a while.
Sound: As mentioned earlier, there's no voiceacting in this game, and I do think that this is to the game's detriment. There's a lot of dialogue in this game, and I think it would've done the story a little better if they had been voice acted. The sound design is alright. Nothing spectacular, but nothing memorable either. The music is good for the first couple of times you hear it; however, since the OST is basically playlisted on repeat throughout the game, you'll end up hearing the same song about six or seven times throughout the course of your playthrough; presuming, of course, that your playthrough is as short as mine. Yet again, just kinda okay. 2/5.
Overall scores are: 5/5/2/2; 4.7/10. Just beneath the borderline of average. I got it in a Humble Bundle a while ago, so I don't feel like I've been burned too badly, but if you've got other puzzle games to play instead of this one, go for them. They'll probably be a better experience for you.