It's simple, original, and fun. The idea behind the game is intuitive to understand and play, and I love the dynamic of being powerful vs powerless depending on the player's and the enemies' colour. I also figured out that if you position yourself just right in front of the enemies without touching them, they'll teleport over you without doing any damage. My only real criticism is that I wish that the player would stop right where the mouse so I could be more precise with my movements instead of just stopping a small distance away from the mouse. Some relaxing background music would be also nice, music can add a lot to the feel of the game.
You can make a great mobile game out of this! I tried it on my mobile device and it works just as well as on my laptop.