This is excellent puzzle game, I really enjoyed it!
Some of visual elements need a little work, it's functional but rough. I also found the "Level" and the "Keyslots" heading distracting from the more important elements in the game.
The puzzles are very well done. The progressive increase in challenge and the amount of variety in mechanics is incredible (amazing that this was done in 48 hours).
There were a lot of things to think about as you moved, but not too much. Though I would of liked at least 1 undo move. I would always overshoot by one especially when I was excited that I solved the puzzle xD.
You did a great job! Very well done! : )