Nice little game! I included it in my Game Maker Toolkit’s Game Jam compilation video series, if you’d like to take a look. :)

I like the way it squishes and stretches jump arcs and wall jumps feel great. Level one was designed very well forced me to understand the mechanics before progressing, the other levels were well designed too. Here is where I could see this game going: precision platformer with multiple solutions to most levels. Moving platforms/walls and walls/platforms that change color periodically. A collectible type thing that floats in mid air that changes your color when you  touch it.  Enemies are different colors and shoot different colored projectiles that interact with the player differently based on what color they are. Plenty of potential here I think this idea has been done before but Im sure you could put a new spin on it