Excellent mechanic and use of theme. It now has me thinking about making a game where you have to match enemies to destroy them. Great tutorial as well, but it would be nice to skip after the first time dying. I was playing with a touchpad instead of a mouse, so I handicapped myself and died a lot until I learned that I could scoot past all enemies instead of engaging them in order to finish the level. It was certainly more fun to destroy them though as it was very satisfying.