Well, that was a very interesting experience!
I like the idea of controlling two characters at the same time, in order to solve puzzles, that require coordinated cooperation! This also works well, when you're playing by yourself with no pardner, which is a very good thing, especially for loners like me! Although, some of the interactions weren't so obvious at the start, so I suggest making a tutorial, that would show the needed interactions.
I also am not really fond of the levels. In my opinion, the first level is a way too hard for a beginning, the second one is pathetically easy, and the third one is a some kind of joke.
Besides the mechanics, I also liked the pixel art graphics, combined with neat little lighting effects, and the calm music playing in the background (though, it did became irritating after some time). Due to these elements, the game presents itself very well!
Overall, this is a pretty good game, but as I said, the levels really need some more work.