Very cute art style and lovely music, it really fits the theme. The movement felt a bit fast, but platforming is also not my strong suit. I quite liked dragging the key and boxes around, though I couldn't seem to get the boxes back out of the starting area or figure out what they were for. It's also unclear what the change colour mechanic is for, so maybe like with the bubble platforms, you could have a little challenge at the start or something for the player to overcome with that mechanic so how it works is a bit clearer.