The Swapper is a wonderfully compelling title in which you have special abilities that allow you to solve puzzles.
Like Portal, the central premise asks the question "How do I exist in two different places at the same time?" or "How do I reach the unreachable place?" Where these games differ is that The Swapper takes the answer to this question quite literally. You're given a gun that fires copies of your controlled character. You can have up to four of these copies, and the clones move in tandem with you. If you move one step forward, they move one step forward, and so forth. You can also project your primary control into any one of them, provided you have a clear unobstructed shot at it. Most of the puzzles revolve around this mechanic, as there's usually a task one clone has to perform to get it into a place where you can control it. Only your primary character can collect the orbs that complete the puzzle. What makes these puzzles tricky is that there are different areas that obstruct your various powers, making you think critically to evaluate what your clones will do. For example, red lights will not allow you to project yourself into a clone, so you must either disable the red light with a switch or work around it. Red light areas still allow you to project new clones, however. Blue lights don't allow new clones, but you can project into existing clones. Purple lights don't allow your powers to work at all. Some puzzles use boxes, but most employ the switches that your clones must activate to manipulate the light areas. Later in the game, you encounter gravity pods that create similar scenarios, only with upside down and rightside up clones doing the work. A primary character can only create a clone that is standing as they are, so there's another layer of gameplay.
As you move through the game, there is a dark, foreboding atmosphere. You're thrust into a sci-fi world of moral and philosophical conflict, and the story is told through a reluctant female voice as well as ship logs. The game's visuals are beautifully realized with darkness and light interplaying in interesting ways. Sound design is also uniformly excellent and realy creates this feeling of isolation and dread, yet you still feel this alien presence. I will not spoil the story for you, but I will say that there are some surprising revelations that are not immediately apparent from the outset. The environments are vast so there's plenty to explore. I was reminded of Super Metroid at many times, except there is no combat in The Swapper.
I think the game's controls and gameplay work wonderfully together to challenge the player without frustration. So many indie titles only have their gimmick to fall back on, but The Swapper combines gameplay, visuals, and narrative seamlessly. Even if you fail to understand how to solve a puzzle, there are plenty of puzzles you can solve while you're thinking about the correct solution. I normally get pretty impatient with puzzle games, but every puzzle in The Swapper is fair, logical, and rewarding.
In summary, this is a fantastic game that you should purchase if you have not purchased it already. It has enough content to warrant whatever price you pay for it, and should satisfy even the most jaded indie fans.