THIRD PARAGRAPH CONTAINS SPOILER FOR ONE OF THE PUZZLES
The puzzle mechanics are very inventive, well-designed and fun to use, once you've figured them out. Because the mechanics are so novel you do have to fight your intuition quite a bit, which is pretty tiring if the game were longer.
The game was a lot of fun to play though. Once you're used to the rules of the game world it's just a joy to figure out the quite challenging puzzles! The introduction of new mechanics is also paced well, although the tutorial could be more thorough in showing the player how the character and the magnet interact with al the basic elements in the game world.
A particular example of this: The second puzzle is not very satisfying to solve as I did not know that the magnet falls through the thin platform instead of landing on top of it.
Definitely going to keep an eye on the development progress. Great work so far Mark! :)