It's a smart way to apply the theme to the enemy. I like the idea. The timer displayed in the right way. A bit unsatisfying because of the unkillable level 1 cell. But it's ok to work like that. However, the invincible cells during the bouncing animation don't feel good. Every millisecond count in the game, don't want to spend time waiting for the animation. The play style needs to be quick but this feature slows it down. Other than that, this is an innovative game. Great job!