The game is fun. I liked the strategy component of having to quickly consider whether it's more worth it to kill or get hit by a yellow enemy given the factors of your health and current combo, and that sort of thing could easily be expanded upon if you wanted to make a bigger game; I think it has a lot of potential. Moving around and swinging enemies is also pretty satisfying. I didn't understand how the combo system worked, though. And you should probably make the enemy colors more different from each other, since I'd imagine some players might have difficulties distinguishing the two. But other than that, great work!