Great puzzles and what a fun concept! It reminds me of fireboy and watergirl, but for some reason it feels much more like the two characters are working together, and the theme of solidarity really shines (especially when you use one to lift the other up). One issue I have is that the physics on the boxes is kind of hard to control, and I found myself getting somewhat stuck and having to pull off weird manuvers to get the boxes where I needed them.