I broke the game pretty fast. On the second screen, while holding the key, I allowed the platform to bring me up. I dropped the key, it flew down the screen and when I went down and pressed the switch for the platform to come down, it pushed me and the key down.
Then I was able to walk through the first box by letting the box drop the key and picking it up right afterwards. I assume this might work for other boxes set up in a similar fashion.
Also, dropping the key while on any solid platform above the ground will result in it passing through the higher up platforms and landing on the ground.
Aside from the collision issues, I find this game very pretty. You did a great job with the visuals.
