Really nice animation on the main character. The push/pull mechanic works very smoothly, and allows much more interesting puzzles than pushing alone. (It would have been more intuitive if you let go the object by letting go the button, but as it is, it works fine.) Cool puzzles and environments.
The floor tiles are too busy--I found it difficult to distinguish objects of interest, including the player character.
Some kind of audio cue would have been helpful when solving a puzzle/activating a switch.
The opening story is interesting, but it could have been told in a slightly more concise way, or perhaps broken up a little bit with gameplay.
Also, I found the viewport too small when the player has to scrutinize elements like specific runes on the walls. I would have appreciated a larger viewport (maybe 3x instead of 2x?) and/or the opportunity to play the game in fullscreen mode.