Very interesting idea and a decent execution. The physics were a tad janky at times, but considering the time constraint thats definitely forgivable.
My only real issue with playing the game was the jump arc of the character. It was a little inconsistent and with a run up you could skip a lot of the puzzles. If this was worked on further, I'd definitely recommend a heavier focus on the gravity gun mechanics and minimise the need for jumping such distances.