A good game and a fun puzzler.
There are a lot of things to like about this game, among those are: the game mechanic of manipulating gravity, a concept which harks back to games like Time Fcuk; the absence of artificial difficulty, i.e. no cheap tactics which make the game frustrating for the wrong reasons; a very straightforward objective not requiring extremely complex tutorials, it has that pick-up-and-play charm.
On the other hand, there are a few things I do not like as much. For one, the puzzles are not too challenging and they seem to take on a linear route. In fact for the first few levels the concept of failure was practically non-existent, and even in the levels when the spikes started popping up, there was not many obstacles which stop the player from reaching their goal. This game would benefit from red herrings, i.e. paths that seem to lead to the destination but actually don't. Please implement this in later stages to add a bit of a challenge and require more planning on the player's part. You may also want to add more enemies or more complex game mechanics! Some truly mind-bending levels would be appreciated.