The idea of this game (creating time clones) is interesting, and that's what made me buy it. However, the implementation is so poor that I couldn't enjoy the game and gave up after forcing myself into a few play sessions.
The controls are clumsy. This game would probably play easier if the camera were just looking from inside the eyes of the character, not from behind. In the first few minutes of the game the camera is even locked at fixed angle, you can't look around the room.
The constant interruptions by the tutorial text which freeze the game are very annoying. Also, it's the mouse click which closes them, but you don't see the cursor itself, which also feels strange. I'd expect clicking "Next" button or "Close". No voice-overs btw, which is, well, ok for a game which you get for a few euros. The text which appears word by word is annoying as well, it should appear just all at once.
The graphics are pretty good, but you very soon notice that there is just a very limited set of models for environmental objects which they constantly re-use in every room. All rooms look the same because of that. In the end it feels more like a tech demo than a finished game, as if they bought some stub assets on the Internet. And the whole game feels generic and anonymous.
No environmental sound whatsoever! You walk around levels in complete silence. There are no footsteps, no buzz from the electronics around you etc. It feels like your sound card is broken or something - yet the music is playing. The music is good btw. The only sound I heard was the jump sound which is much like the Game Boy's Mario jump sound from the early 90s. Completely out of place.
The story is badly written. The very first message you get by pressing E on something in the first room is unintelligeble, and the rest even more, so I stopped reading them after the 3rd one.
Like in most puzzle games, the actual puzzles are more a chore than fun to solve, with some rare exceptions. It's just that the set of actions the player can do is so small that not much interesting could be built around it, and the time-rewinding mechanics doesn't really save it. You step on buttons, run, jump, and carry keys. Then more of the same, and then some more, without any sense of progress or direction. They make a clumsy attempt to get you interested in solving the puzzles in a "perfect" way to earn stars (as if this were some casual game on iOS) but frankly I didn't bother at all. Stars feel too cheap for a 3D game where you control a character. At least in Portal it felt like a mix of FPS and puzzle, not just a puzzle.
Apparently there are some bugs with collisions, I got them every 15-20 minutes. Sometimes the character can collide into some object of the environment and get completely stuck (can't move/jump anymore). Once I got the character smashing into the edge of a cliff, stuck in the animation of running. If you jump on a rising platform, the feet sink in it. Camera frequently gets inside objects, including the character himself.
Honestly, this product looks like a prototype for a game, not a real game on sale. It may be ok for the game's low price but cmon, the idea of time rewinds around which this game is designed deserves so much more!