I thought it was fixed, but in fullscreen the limits for the player desappear. I will look into that, I didn't notice.
The time on screen is your life, you gain time by killing enemies and lose time by getting hit by the enemies. And once you gather enough light babies you are faced by the boss. Maybe is a little easy before the boss appears but trust me... you will have to move and avoid in order to beat her.
Thanks for the feedback!