Outstanding game!! After completing all 36 puzzles (whew), I am so impressed with the puzzle designers here: the approach to solving these puzzles never became repetitive or formulaic, even with so many puzzles included in the game. The introduction of new mechanics with each color level helped to keep it fresh -- you used your light beam concept here to great effect, as you did with the glass, light detection, etc.
I finished the puzzles over two days, and as a hallmark of a great puzzle game, when I went to sleep my brain was still pushing boxes (a la Tetris). I was stumped several times, and I left the game but felt motivated to return. One of the puzzles, if my solution was the only solution, showed a mix of humor and cruelty that I enjoyed (well, once it was solved).
Everything here feels professional and polished. The music -- which I understand to be actual analog recorded music, made for this game -- was fitting and fun. I only wish there were a second gameplay song! I also really liked the hand-drawn character and art. This game feels like it could already be posted in a game store, but if you develop anything further, you might add more of the cutscene art that appears in the intro, interspersed within the game. I felt a connection to the character and place at the start, but after a dozen puzzles or so, my mind treated it as abstract box-pushing, like mathematics. I felt disappointed not to see more of the moving truck and boxes and scenes of the house -- I liked those. I also realize you had only 7 days, and this game was all the more impressive in light of that.
Excellent!